J/ApJS/216/26 GALEX search for T Tauri in Taurus-Auriga (Gomez de Castro+, 2015)
A GALEX-based search for the sparse young stellar population in the
Taurus-Aurigae star forming region.
Gomez de Castro A.I., Lopez-Santiago J., Lopez-Martinez F., Sanchez N.,
Sestito P., de Castro E., Cornide M., Gestoso J.Y.
<Astrophys. J. Suppl. Ser., 216, 26 (2015)>
=2015ApJS..216...26G 2015ApJS..216...26G
ADC_Keywords: YSOs ; Photometry, ultraviolet ; Photometry, infrared ;
Photometry, RI
Keywords: Galaxy: stellar content; stars: variables: T Tauri, Herbig Ae/Be;
surveys; ultraviolet: stars
Abstract:
In this work, we identify 63 bona fide new candidates to T Tauri stars
(TTSs) in the Taurus-Auriga region, using its ultraviolet excess as
our baseline. The initial data set was defined from the GALEX all sky
survey (AIS). The GALEX satellite obtained images in the
near-ultraviolet (NUV) and far-ultraviolet (FUV) bands where TTSs show
a prominent excess compared with main-sequence or giants stars. GALEX
AIS surveyed the Taurus-Auriga molecular complex, as well as a
fraction of the California Nebula and the Perseus complex; bright
sources and dark clouds were avoided. The properties of TTSs in the
ultraviolet (GALEX), optical (UCAC4), and infrared (2MASS) have been
defined using the TTSs observed with the International Ultraviolet
Explorer reference sample. The candidates were identified by means of
a mixed ultraviolet-optical-infrared excess set of colors; we found
that the FUV-NUV versus J-K color-color diagram is ideally suited for
this purpose. From an initial sample of 163313 bona fide NUV sources,
a final list of 63 new candidates to TTSs in the region was produced.
The search procedure has been validated by its ability to detect all
known TTSs in the area surveyed: 31 TTSs. Also, we show that the
weak-lined TTSs are located in a well-defined stripe in the FUV-NUV
versus J-K diagram. Moreover, in this work, we provide a list of TTSs
photometric standards for future GALEX-based studies of the young
stellar population in star forming regions.
Description:
The baseline of the GALEX All Sky Survey was completed in 2007.
GALEX/AIS covers 26000deg2 (∼63% of the Sky) and provides broadband
imaging in two UV bands (near-UV in the 1770-2730Å spectral range
and far-UV in the 1350-1780Å range). GALEX obtained 197 images on
the Taurus molecular cloud for a total coverage of ∼200deg2 (see
Figure 4).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 94 93 T Tauri stars (TTSs) and candidates found in the
Taurus molecular cloud (TMC) from the GALEX AIS
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See also:
I/322 : UCAC4 Catalogue (Zacharias+, 2012)
II/312 : GALEX-DR5 (GR5) sources from AIS and MIS (Bianchi+ 2011)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
J/ApJ/756/171 : HST FUV survey of H2 emission of T Tau stars (France+, 2012)
J/ApJ/744/121 : Far-UV spectroscopy of T Tau stars (Yang+, 2012)
J/AJ/142/138 : All-sky catalog of bright M dwarfs (Lepine+, 2011)
J/ApJS/196/4 : New young star candidates in Taurus-Auriga (Rebull+, 2011)
J/ApJ/720/480 : DISCS. I. Taurus protoplanetary disk data (Oberg+, 2010)
J/A+A/519/A83 : T Tau stars toward the Taurus-Auriga region (Takita+ 2010)
J/AJ/139/1338 : UV-selected stars in Tau and Upper Sco (Findeisen+, 2010)
J/A+A/438/769 : PMS stars Proper Motion Catalog (Ducourant+, 2005)
J/A+AS/132/173 : New weak-line T Tauri stars in Taurus-Auriga (Li+ 1998)
J/A+A/312/439 : New T Tauri stars in Taurus-Auriga (Wichmann+, 1996)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 9 F9.6 deg RAdeg Right Ascension in decimal degrees (J2000) (1)
11- 19 F9.6 deg DEdeg Declination in decimal degrees (J2000) (1)
21- 25 F5.2 mag FUVmag [15.8/22.6] GALEX FUV band magnitude
27- 31 F5.2 mag NUVmag [13.8/21.7] GALEX NUV band magnitude
33- 38 F6.3 mag rmag [9.3/16.1] UCAC4 R2 band magnitude;
Zacharias et al. 2013 (Cat. I/322)
40- 44 F5.2 mag Jmag [7.4/13.9] 2MASS J band magnitude
46- 50 F5.2 mag Hmag [6.6/13.4] 2MASS H band magnitude
52- 56 F5.2 mag Ksmag [6.2/13.1] 2MASS Ks band magnitude
58- 79 A22 --- ID Source identifier if any
81- 94 A14 --- Type Object type (CTTS, WTTS or candidates)
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Note (1): Coordinates from the GALEX NUV source position in the GALEX catalog.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 04-Mar-2015