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12 New Galactic Wolf-Rayet Stars Identified via 2MASS+Spitzer/GLIMPSE
We report new results from our effort to identify obscured Wolf-Rayetstars in the Galaxy. Candidates were selected by their near-infrared(Two Micron All Sky Survey; 2MASS) and mid-infrared (Spitzer/GLIMPSE)color excesses, which are consistent with free-free emission fromionized stellar winds and thermal excess from hot dust. We haveconfirmed 12 new Wolf-Rayet stars in the Galactic disk, including nineof the nitrogen subtype (WN), and three of the carbon subtype (WC); thisraises the total number of Wolf-Rayet stars discovered with our approachto 27. We classify one of the new stars as a possible dust-producingWC9d+OBI colliding-wind binary, as evidenced by an infrared excessresembling that of known WC9d stars, the detection of OBI featuressuperimposed on the WC9 spectrum, and hard X-ray emission detected byXMM-Newton. A WC8 star in our sample appears to be a member of thestellar cluster Danks 1, in contrast to the rest of the confirmedWolf-Rayet stars that generally do not appear to reside within densestellar clusters. Either the majority of the stars are runaways fromclusters, or they formed in relative isolation. We briefly discussprospects for the expansion and improvement of the search for Wolf-Rayetstars throughout the Milky Way Galaxy.
| A homogeneous catalog of new UBV and H-beta photometry of B- and A-type stars in and around the Scorpius-Centaurus OB association
B- and A-type stars in and near the Sco-Cen OB association areinvestigated with UBV and H-beta photometry to acquire data relevant tothe luminosity function of Sco-Cen. The measurements generally consistof two 10-s integrations of U, B, V, (W, N) filters, and theobservations are corrected iteratively for atmospheric extinction andinstrumental response. The data presented give the mean V magnitude,mean B-V, mean U-B, and the estimated uncertainties for these values.The catalog provides a homogeneous catalog of data for a large fieldwith stellar objects delineating membership to the association Sco-Cenand that affect the luminosity function of the aggregate.
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Osservazione e dati astrometrici
| Costellazione: | Croce del Sud |
| Ascensione retta: | 12h13m57.29s |
| Declinazione: | -57°56'39.4" |
| Magnitudine apparente: | 7.908 |
| Distanza: | 380.228 parsec |
| Moto proprio RA: | -16.7 |
| Moto proprio Dec: | -2.2 |
| B-T magnitude: | 8.033 |
| V-T magnitude: | 7.919 |
Cataloghi e designazioni:
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NEWS@SKY (Science&Space News)
