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J/A+A/435/575   86GHz SiO maser survey of late-type stars. III (Messineo+, 2005)

86 GHz SiO maser survey of late-type stars in the Inner Galaxy. III. Interstellar extinction and colours of the SiO targets Messineo M., Habing H.J., Menten K.M., Omont A., Sjouwerman L.O., Bertoldi F. <Astron. Astrophys. 435, 575 (2005)> =2005A&A...435..575M
ADC_Keywords: Stars, late-type ; Infrared sources ; Masers ; Extinction Keywords: stars: dust, extinction - stars: AGB and post-AGB - stars: mass-loss - infrared: stars - circumstellar matter - Galaxy: stellar content Abstract: We have determined extinction corrections for a sample of 441 late-type stars in the inner Galaxy, which we previously searched for SiO maser emission, using the 2MASS near-infrared photometry of the surrounding stars. From this, the near-infrared extinction law is found to be approximated by a power law Alambda∝lambda-1.9±0.1. Near- and mid-infrared colour-colour properties of known Mira stars are reviewed. From the distribution of the dereddened infrared colours of the SiO target stars we infer mass-loss rates between 10-7 and 10-5M/yr. Description: 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. J/A+A/393/115, 2004, Cat. J/A+A/418/103). 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, J/A+A/393/115), and are the same as those used in Table 2 by Messineo et al. (2004, J/A+A/418/103). 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. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 23 444 Interstellar extinction estimates Ak in the direction of SiO targets
See also: J/A+A/393/115 : 86GHz SiO maser survey of late-type stars (Messineo+, 2002) J/A+A/418/103 : 86GHz SiO maser survey in the Inner Galaxy (Messineo+, 2004) Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 3 I3 --- [MHS2002] Identification number (1) 5- 9 F5.2 mag Aks Interstellar extinction in Ks-band 11- 15 F5.2 mag s-Aks Dispersion of individual extinctions of field stars 17- 21 F5.2 mag Tot ? Total (circumstellar plus interstellar) extinction 23 I1 --- Fg [1]? Flag for foreground objects(2)
Note (1): The number of targeted positions searched for SiO maser emission in Messineo et al. (2002, Cat. J/A+A/393/115) is 441. As three positions showed a double 86GHz SiO maser detection, the line identification number goes up to 444. Note (2): The flag Fg is unity when the SiO target is classified as a foreground object.
Acknowledgements: Maria Messineo, messineo(at)eso.org
(End) Patricia Vannier [CDS] 21-Feb-2005
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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