If you are using MagE spectrograph in order to do some time resolved observation and you want to use MagE's Python based pipeline (by Dan Kelson), you will have to do an extra step.
MagE's python based pipeline took all of your spectra that have the same header and add them in order to get better S/N. So if you want to have them one by one, you must change the headers in order that every single spectra is named different and, subsequently will be reduced alone.
Thursday 24 February 2011
Thursday 10 February 2011
cool character's character XD
You should check this page! http://www.galeon.com/dibujosce/
This guy is awsome!
This guy is awsome!
_____
__ .-'` `'-. __
/ _'-._.-'--, ,--'-._.-'_ \
| / ' .' .--.\ /.--. '. ' \ |
|| .' .:/____\\ //____\:. '. ||
\,/. | \o/ | | \o/ | .\,/
,-`/ :. '.___.| |.___.' .: \`-,
,--`/. '::' / / \ \ '::' .\`--,
,'--'| :. /` / \ `\ .: |'--',
,'`. \ ':.:' /` (`'---'`) `\ ':.:' / `',
,' _ '-..--'| . '. .' . |'--..-' ',
`.-` \ .' `:` '. / `-.`
`.-'_ . _ \,__.--'--.__,/ __ . _'-.`
' `/.-' ''-) (-'' '-.\`
| |
jgs | |
\ /
'.________.'-=[ Bambi ]=- , //\ / | ; | /_| .-"` `"-. /` `\ / \ .-.,_| .-""""-. | | `",_,-' (((-. '( \ (`"=._.'/ ( (o>'-`"# , '.`"-'` / `--` '==; /\\ `'--'`\ _.'~~ / | \ `.,___,-} | | | ) { } \ \ (.--==---==-------=' o { } ",/` (_) (_) (_) (_) \ / / () o () () ^| \ () ( () o ; / `\ \ ; / } | ) \ / /` } / ,-' |=,_ | /,_ ,'/ | _,.-`/ `"=\ \\ \ | ."` \ | \ \`\ \ | | \ \ `\ \ `\ \ | | \ \ `\ \ \ \ | | \ \ \ \ \ \ | | \ \ \ \ \ \ | | \ \ \ \ \ \ | | ) \ \ \ ) \ jgs `) \ ^ww ) \ ^ww ^ww ^ww__,,,,,,,,,_ .-' ___ .\ / /__ `\ , `\ ,""") / @ \ =\ : `\ .\_/`"'".`~'""'~' : `\ :. _\____,; . ;`. `\ : `\_| .) .: .' `. \ ' \...:/ /\`. `. \ `-._\::/ ./. \ `. ; \ _.)--'`--....-'.' ( \_) `. \ | _( -== .' \ `"'' .( -=- ,' \ ( =-= ) \ `( -= ) . `\ .' `( - ); ; `\ ; `( _.'.' .' \ , ; .';`"'~~'` .' .'; ;' ). \\\_; ;: :'(( _.' ( ; ). jgs .'`: ''"' \ ; ) _,-----'" `._ .-' - ._; )' / / __.`._ .' / `--' `'`'`'`'`''""" `": , ; :_/ / .' `''--'`-=[ Mary Poppins ]=- _ .-' '-. / \ |,-,-,-,-,| ___ | _)_(_ | (/ \) | _\_/_ /) / \_/ \// |( )\/ ||)_( |/ \ n| | / \ | |_|___| \|/ jgs _/L\_@@ Mr. Potato-Head (Toy Story) @@ .-"'"-. | | (`-._____.-') .. `-._____.-' .. .', :./'.== ==.`\.: ,`. : ( : ___ ___ : ) ; '._.: |0| |0| :._.' / `-'_`-' \ _.| / \ |._ .'.-| ( ) |-.`. //' | .-"`"`-'"`"-. | `\\ || | `~":-...-:"~` | || || \. `---' ./ || || '-._ _.-' || / \ _/ `~:~` \_ / \ ||||\) .-' / \ `-. (/|||| \||| (`.___.')-(`.___.') |||/ '"' jgs `-----' `-----' '"' (¯`-»JØRGÊ«-´¯)®~ Road Runner ~ __ / \ __ .---. _ / / _.~ \ \ `. / \ / /.-~ __/ `\ \ | | |/ .-~ __ \ \ | | | .'--~~ \ \ \ | | ` ' _______/ \ \ | ` / .--. \ \ | ` / \ `.\ \ \ / `\ \ \ `\ ( \ \ \ > ,-.-. \ `. \ / | \ \ \ . \ /___| O |O\ , .-. \ ; | /` `^-.\.-'`--'/ \ `; | | / `\ \ | `. `--..____,' \ `. | `._ _.-'^ \ . / `|`|` .-.\ / | | \ `\ / | | `\ ` | | | \ | | | .-. | | | \ `. \ | | `\ \ | | \ \ | | \_____ :-'~~~~~'-' ; /____;``-. : <____( `. ; \___\ ; .' /``--'~___.-' /\___/^/__/ / /' /`/' \ \ `\ \ `\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ ______ \ \ ___\ \'~``______)> jgs \ \___ _______ __)> _____\ \'~``______)> <(_______.._______)>-=[ Pepe LePew-- You find me irresistible, no? ]=- _..._ ___ .:::::::. `"-._.-''. , /:::::::::\ ': \ _._ \:-::::::::::::\ :. | /|.-' /:::\ \::::::::\:::::| ': | | / |:::| `:::::::|:::::\ ': | `\ | __ |\::/\ `-:::-|::::::| ': | .`\ .\_.' `.__/ | |::::::\ ':. | \ ';:: /.-._ , / |:::::::| :. / ,`\;:: \'./0) |_.-/ ;:::::::| ': | \.`;::. `` | | \::::::/ :' / _\::::' / / \::::| :' / ,=:;::/ | \:::| :' | (='` // / | \::\ `: / '--' | /\ | \:::. `:_|.-"""-. \__.-'/::\ | '::::.:::...:::. '. /:::| | '::/::::::::::::. '-.__.:::::| | |::::::::::::\::..../::::::| / |:::::::::::::|::::/:::::::// \:::::::::::::|'::/::::::::/ /\::::::::::::/ /:::::::/:| |::';:::::::::/ |::::::/::; |:::/`-:::::;;-._ |:::::/::/ |:::| `-::::\ `|::::/::/ jgs |:::| \:::\ \:::/::/ /:::/ \:::\ \:/\:/ (_::/ \:::;__ \\_\\___ (_:/ \::):):)\:::):):) `" `""""` `""""""`.------------------------. | PSYCHIATRIC | | HELP 5¢ | |________________________| || .-"""--. || || / \.-. || || | ._, \ || || \_/`-' '-.,_/ || || (_ (' _)') \ || || /| |\ || || | \ __ / | || || \_).,_____,/}/ || __||____;_--'___'/ ( || |\ || (__,\\ \_/------|| ||\||______________________|| |||| | |||| THE DOCTOR | \||| IS [IN] _____| \|| (______) jgs `|___________________//||\\ //=||=\\ ` `` `-=[ Linus ]=- ,--.,-"";-"-. .-;-/ / / .- `\ .-. ` ( ' ' ` ; `\/ \ \ / \ / (. C . ) | .-. | | _ / (` / | \ /}| | )(\ | `-> (____.| / ||| / \=====| | |\| | |====| \ _/ ` \__/=====| |` `-'======| \ |=======/ | |=======| | .--, ########\ |/ / jgs |_|__|| ` `--. ,---;-'--'\ `--. `---`-------'-.___,___.---' (¯`-»JØRGÊ«-´¯)® -=[ Schroeder ]=- ,--""""-., .'` ', / | | _ / __,'(,-'/ `\ _. / .=="=| '-. | .'===,=|-. | / /===\==\| \ \ _;' | |====\==\ '.___,u' \__/ |===.##,=\ |==/####\='-.__ \#|#####|`/^|_))._________________ #######/`| |_.-'""""""=' ] #####/\/ /__,________;------.---' jgs `###' |_/ V V (¯`-»JØRGÊ«-´¯)®
Friday 4 February 2011
Curiosity
Hecho curioso:
Para aquellos que estudian optica y saben que un Interferometro de Fabry-Perot constituido por una placa con dos superficies reflectantes, o dos espejos paralelos altamente reflectantes, tambien se llama Etalon. Aparentmente, hay un lugar en Francia, Somme, que tambien se llama Etalon e historicamente, su poblacion ha crecido en 44 personas en 30 agnos... lo chistoso es que del 80, que tenia 104 personas, aumento su poblacion a 149 en el 2006...
For the optic students who know that a Fabry-Perot Interferometer, made of a transparent plate with two reflecting surfaces, or 2 parallel highly reflecting mirrors is also called etalon. There is a place in Somme, France, also named Etalon who's population has growth 44 persons in 30 years... funny thing is that from the 80`s that had 104 inhabitants, increased to 149 in 2006....
Thursday 3 February 2011
Febrero: el mes favorito para nacer
Ayer gracias a San Facebook, vi un gran incremento en el radio de natalidad del 2 de Febrero. Busque en cumplea;os Febrero y habia bastantes mas de los que hay por ejemplo en Agosto y me pregunte: habra un mes favorito para nacer?
Aparentemente muchos cientificos se lo han preguntado, lamentablemente no pude encontrar un estudio Chileno al respecto (acepto sugerencias), pero si uno estadounidense. Ociosamente, me lei gran parte del paper en donde estadisticamente encontraban que el mes favorito para nacer era Agosto y el mas pobre, Abril. Podemos extrapolar que siendo un estudio del hemisferio Norte, en el hemisferio Sur sus equivalentes (segun las estaciones del a;o) serian oh! Febrero y Octubre.... Febrero coincide con mi poco cientifica busqueda de natalidad Chilena!... ahora, lo entrete es que ademas, hay un dia favorito de la semana para nacer en gringolandia: el Martes... Porque el Martes?? que misterio.... Y el menos favorito para nacer es el Domingo y el segundo menos favorito, el Sabado.
Yo naci un viernes, y di a luz un MARTES... NOOOOO maldita estadistica!!!
Explicaciones entretenidas sobre las preferencias de natalidad son bienvenidas, mientras no rayen en la ordinariez. XD
El paper de donde saque esta informacion esta aqui:
www.cdc.gov/nchs/data/nvsr/nvsr50/nvsr50_05.pdf
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Aparentemente muchos cientificos se lo han preguntado, lamentablemente no pude encontrar un estudio Chileno al respecto (acepto sugerencias), pero si uno estadounidense. Ociosamente, me lei gran parte del paper en donde estadisticamente encontraban que el mes favorito para nacer era Agosto y el mas pobre, Abril. Podemos extrapolar que siendo un estudio del hemisferio Norte, en el hemisferio Sur sus equivalentes (segun las estaciones del a;o) serian oh! Febrero y Octubre.... Febrero coincide con mi poco cientifica busqueda de natalidad Chilena!... ahora, lo entrete es que ademas, hay un dia favorito de la semana para nacer en gringolandia: el Martes... Porque el Martes?? que misterio.... Y el menos favorito para nacer es el Domingo y el segundo menos favorito, el Sabado.
Yo naci un viernes, y di a luz un MARTES... NOOOOO maldita estadistica!!!
Explicaciones entretenidas sobre las preferencias de natalidad son bienvenidas, mientras no rayen en la ordinariez. XD
El paper de donde saque esta informacion esta aqui:
www.cdc.gov/nchs/data/nvsr/nvsr50/nvsr50_05.pdf
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LEMNISCATE-LEMNISCATA
Thanks to my office mate, and the search of her "occasional" word of the day, I found out about this:
http://mathworld.wolfram.com/Lemniscate.html
LEMNISCATE
In Algebraic geometry lemniscate refers to any of several figure-eight shaped curves (like infinity sign), including the Lemniscate of Bernoulli andLemniscate of Gerono.Gracias a mi companera de oficina q tiene su "ocasional" palabra del dia, Me entere de esta ^^ :
LEMNISCATA
En geometria algebraica, la lemniscata se refiere a varias curvas con forma de 8 (como el simbolo infinito), incluyendo la Lemniscata de Bernoulli y la Lemniscata de Gerono.
http://mathworld.wolfram.com/Lemniscate.html
Wednesday 2 February 2011
AM CVn Stars:Status and Challenge
If you're interested on Solheim paper and don't want to read it, here is the 1 page review of the review!! LOL
J.-E SOLHEIM paper review:
AM CVn stars are short-period binary stars in which a white dwarf (WD) accretes material from a low-mass donor star. Initially they're detached, but they evolved into semidetached contact under certain conditions. These are among the first possible detectable sources of low frequency gravitational wave (GW) radiation, since their evolution toward shorter periods is driven by angular momentum lost due GW radiation. They also represents the terminal phase of a binary star evolution, as been compact and hydrogen low systems by studying these we can study physics under extreme conditions.
There are 3 possible channels for donor evolution: The WD Channel is when Roche lobe overflow happens between 2 WDs, where the donor star is the smallest and helium rich. For this channel there is a Direct-Impact phase. With small mass ratios, the distance between the WDs become shorter because of GW radiation and the accretion stream hit directly on the accretor's surface. Observation of accretor is possible during this phase.
If The Helium-Star Channel the donor star is the nondegenerate core of a 2.5-5 solar masses star that may be at different stages of He exhaustion in the core at the time of contact. Finally, The Hydrogen Star Channel is the less probable. It happen when in a regular Cataclysmic Variable star, the donor lost most of its hydrogen so it's the remnant of a low-mass main-sequence star.
A possible outcome of AM CVn stars is explosive events, such as SN Ia type or SN .Ia supernova, being SN 2005E, a helium accreting binary WD supernova, a good candidate for the first observed SN .Ia with AM CVn progenitor.
The Am CVn objects can be divided in 4 groups according to disk properties: 1.-Ultrashort periods an no disk (P<12 m), 2.-Large stable disks in superoutburst state (12
<20 m), 3.- Variable-size disk, with outburst and occasional superoutburst (20
<40 m) and 4.- Small stable disk (P>40 m). For the last one, the spectra changes from a high state with absorption lines to a low state with emission lines.
In last 10 years AM CVn stars number had increased because of the large observation campaigns, rising them up to 25 systems. Thanks to this, density and population estimations have improved. There are 2 evolution scenarios: the optimistic case and the pessimistic case. Roelofs et al. predicted sky surface density of Am CVn stars based on T_eff, M_g, Galaxy population models and WD and helium progenitors assumed evolution. The predicted density of AM CVn stars resulted to be highest for low Galactic latitudes, with an error lower than a factor 2. But the predicted density for optimistic case and the pessimistic case are far from reality. This is telling us that something may be overlooked and there still work to be done.
"The strange star SS433 may be a black hole whose accretion disk is highly inclined with respect to its orbit about a companion star. Digital, cover, February 2005 "Astronomy" magazine."
Image used with the permission of Don Dixon, FIAAA
Scientific Illustration
http://cosmographica.com/gallery/portfolio2007/content/index_28.html
Very soon in Spanish as well (hopfully!) XD enjoy
J.-E SOLHEIM paper review:
AM CVn stars are short-period binary stars in which a white dwarf (WD) accretes material from a low-mass donor star. Initially they're detached, but they evolved into semidetached contact under certain conditions. These are among the first possible detectable sources of low frequency gravitational wave (GW) radiation, since their evolution toward shorter periods is driven by angular momentum lost due GW radiation. They also represents the terminal phase of a binary star evolution, as been compact and hydrogen low systems by studying these we can study physics under extreme conditions.
There are 3 possible channels for donor evolution: The WD Channel is when Roche lobe overflow happens between 2 WDs, where the donor star is the smallest and helium rich. For this channel there is a Direct-Impact phase. With small mass ratios, the distance between the WDs become shorter because of GW radiation and the accretion stream hit directly on the accretor's surface. Observation of accretor is possible during this phase.
If The Helium-Star Channel the donor star is the nondegenerate core of a 2.5-5 solar masses star that may be at different stages of He exhaustion in the core at the time of contact. Finally, The Hydrogen Star Channel is the less probable. It happen when in a regular Cataclysmic Variable star, the donor lost most of its hydrogen so it's the remnant of a low-mass main-sequence star.
A possible outcome of AM CVn stars is explosive events, such as SN Ia type or SN .Ia supernova, being SN 2005E, a helium accreting binary WD supernova, a good candidate for the first observed SN .Ia with AM CVn progenitor.
The Am CVn objects can be divided in 4 groups according to disk properties: 1.-Ultrashort periods an no disk (P<12 m), 2.-Large stable disks in superoutburst state (12
<20 m), 3.- Variable-size disk, with outburst and occasional superoutburst (20
<40 m) and 4.- Small stable disk (P>40 m). For the last one, the spectra changes from a high state with absorption lines to a low state with emission lines.
In last 10 years AM CVn stars number had increased because of the large observation campaigns, rising them up to 25 systems. Thanks to this, density and population estimations have improved. There are 2 evolution scenarios: the optimistic case and the pessimistic case. Roelofs et al. predicted sky surface density of Am CVn stars based on T_eff, M_g, Galaxy population models and WD and helium progenitors assumed evolution. The predicted density of AM CVn stars resulted to be highest for low Galactic latitudes, with an error lower than a factor 2. But the predicted density for optimistic case and the pessimistic case are far from reality. This is telling us that something may be overlooked and there still work to be done.
Image used with the permission of Don Dixon, FIAAA
Scientific Illustration
http://cosmographica.com/gallery/portfolio2007/content/index_28.html
Very soon in Spanish as well (hopfully!) XD enjoy
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