J/A+A/519/A83 T Tau stars toward the Taurus-Auriga region (Takita+ 2010)
A survey of T Tauri stars with AKARI toward the Taurus-Auriga region.
Takita S., Kataza H., Kitamura Y., Ishihara D., Ita Y., Oyabu S., Ueno M.
<Astron. Astrophys. 519, A83 (2010)>
=2010A&A...519A..83T 2010A&A...519A..83T
ADC_Keywords: Infrared sources ; Stars, late-type ; Stars, pre-main sequence
Keywords: stars: formation - stars: late-type - stars: pre-main sequence -
infrared: stars
Abstract:
We search for new T Tauri star (TTS) candidates with the mid-infrared
(MIR) part of the AKARI All-Sky Survey at 9 and 18µm wavelengths.
We used the point source catalogue (PSC) obtained by the Infrared
Camera (IRC) on board AKARI. We combined the 2MASS PSC and the 3rd
version of the USNO CCD Astrograph Catalogue (UCAC) with the AKARI
IRC-PSC, and surveyed 517 known TTSs over a 1800-square-degree part of
the Taurus-Auriga region to develop criteria to extract TTSs. We
considered asymptotic giant branch (AGB) stars, post-AGB stars,
planetary nebulae (PNe), and galaxies, which have similar MIR colours,
to separate TTSs from these sources. We finally searched for new TTS
candidates from AKARI IRC-PSC in the same Taurus-Auriga region.
Of the 517 known TTSs, we detected 133 sources with AKARI: 46 sources
were not detected by IRAS. Based on the colour-colour and
colour-magnitude diagrams made from the AKARI, 2MASS, and UCAC
surveys, we propose the criteria to extract TTS candidates from the
AKARI All-Sky data, and 68/133 AKARI detected TTSs have passed these
criteria. On the basis of our criteria, we selected 176/14725 AKARI
sources as TTS candidates that are located around the Taurus-Auriga
region. Comparing these sources with SIMBAD, we found that 148 are
previously identified sources including 115 young stellar objects
(YSOs), and 28 unidentified sources.
Based on SIMBAD identifications, we infer the TTS-identification
probability using our criteria to be ∼75%. We find 28 TTS candidates,
of which we expect ∼21 to be confirmed once follow-up observations can
be obtained. Although the probability of ∼75% is not so high, it is
affected by the completeness of the SIMBAD database, and we can search
for TTSs over the whole sky, and all star-forming regions.
Description:
AKARI, UCAC, and 2MASS photometric parameters of previously known
T Tau stars (table 1) and new T Tau candidates (table 2).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 123 133 AKARI, UCAC, and 2MASS photometric parameters
of previously known T Tauri stars
table2.dat 123 28 AKARI, UCAC, and 2MASS photometric parameters
of new T Tauri star candidates
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See also:
II/297 : AKARI/IRC mid-IR all-sky Survey (ISAS/JAXA, 2010)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
I/315 : UCAC3 Catalogue (Zacharias+ 2009)
Byte-by-byte Description of file: table1.dat table2.dat
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Bytes Format Units Label Explanations
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2- 15 A14 --- AKARI AKARI source name (HHMMSSs+DDMMSS) (1)
17- 39 A23 --- Name Common name (for known T Tau stars only) (3)
41- 46 F6.3 mag S9W ?=99.999 S9W magnitude in AKARI-vega system (2)
48- 53 F6.3 mag e_S9W ?=99.999 Error in S9W magnitude in AKARI-vega
system
55- 60 F6.3 mag L18W ?=99.999 L18W magnitude in AKARI-vega system (3)
62- 67 F6.3 mag e_L18W ?=99.999 Error in L18W magnitude in AKARI-vega
system
69- 74 F6.3 mag UCmag ?=99.999 UCAC3 magnitude (4)
76- 81 F6.3 mag e_UCmag ?=99.999 Error in UCAC magnitude
83- 88 F6.3 mag Jmag ?=99.999 2MASS J magnitude
90- 95 F6.3 mag e_Jmag ?=99.999 Error in 2MASS J magnitude
97-102 F6.3 mag Hmag ?=99.999 2MASS H magnitude
104-109 F6.3 mag e_Hmag ?=99.999 Error in 2MASS H magnitude
111-116 F6.3 mag Kmag ?=99.999 2MASS Ks magnitude
118-123 F6.3 mag e_Kmag ?=99.999 Error in 2MASS K magnitude
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Note (1): Ishihara et al., 2010A&A...514A...1I 2010A&A...514A...1I (Cat. II/297).
The sources should be referred in the literatures by their full name
(AKARI-IRC-V1) followed by the letter 'J' and the objName, e.g.,
AKARI-IRC-V1 J0123498-025805
Note (2): The zero-magnitude flux densities are:
* for the S9W band: 56.262Jy
* for the L18W band: 12.001Jy
Note (3): 1RXS J032409.7+123745 seems to be a giant star.
Note (4): The UCAC magnitude is derived from aperture photometry.
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Acknowledgements:
Satoshi Takita, takita(at)ir.isas.jaxa.jp
References:
Ishihara et al., 2010A&A...514A...1I 2010A&A...514A...1I (Cat. II/297)
Skrutskie et al., 2006AJ....131.1163S 2006AJ....131.1163S (Cat. II/246, VII/233)
Zacharias et al., 2010AJ....139.2184Z 2010AJ....139.2184Z (Cat. I/315)
(End) Satoshi Takita [Japan], Francois Ochsenbein [CDS] 20-Aug-2010