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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
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:
FileName Lrecl Records Explanations
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
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
Bytes Format Units Label Explanations
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
Note (1): Ishihara et al., 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.
Acknowledgements: Satoshi Takita, takita(at)ir.isas.jaxa.jp References: Ishihara et al., 2010A&A...514A...1I (Cat. II/297) Skrutskie et al., 2006AJ....131.1163S (Cat. II/246, VII/233) Zacharias et al., 2010AJ....139.2184Z (Cat. I/315)
(End) Satoshi Takita [Japan], Francois Ochsenbein [CDS] 20-Aug-2010
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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