86GHz SiO maser survey of late-type stars. III (Messineo+, 2005)

Details 86GHz SiO maser survey of late-type stars. III (Messineo+, 2005) 86GHz SiO maser survey of late-type stars. III (Messineo+, 2005)

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005ycat..34350575m&link_type=abstract

VizieR On-line Data Catalog: J/A+A/435/575. Originally published in: 2005A&A...435..575M

Physics

Stars: Late-Type, Infrared Sources, Masers, Extinction

Scientific paper

A catalogue of interstellar extinction estimates is presented for a sample of 441 stars which we previously searched for SiO maser emission (Messineo et al. 2002, Cat. , 2004, Cat. ). The identification source numbers (e.g #99) are taken from Table 2 (86 GHz SiO maser detections) and Table 3 (non-detections) in Messineo et al. (2002, ), and are the same as those used in Table 2 by Messineo et al. (2004, ).
We estimated a mean extinction Aks in the direction of each SiO star by using 2MASS stars within 2-4 arcmin of each SiO star. We therefore shifted the colours of field stars (J-Ks) and (H-Ks) versus Ks magnitudes along the reddening vector onto the reference RGB. For fields with Aks<1.6mag table3 lists the extinction values determined from the (Ks,J-Ks) plane, at larger extinction values those from the (Ks,H-Ks) plane. For 46 "foreground" SiO targets Aks is an extinction estimate obtained by directly shifting the colours of the SiO target on the (H,Ks)-[15] colour-colour sequence.
The total (circumstellar plus interstellar) extinction of each SiO target is measured by assuming a stellar photospheric (J-Ks)0 colour of 1.4mag and an (H-Ks)0 colour of 0.5mag.
A group of 46 mostly very bright target stars (Ks<6.0), marked with flag Fg=1, have total extinctions lower (a least 1 sigma) than the "field" extinction and are therefore likely to be foreground objects.
(1 data file).

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