Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...257..118h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 257, no. 1, p. 118-127.
Astronomy and Astrophysics
Astrophysics
19
Blue Stars, Distance, Interstellar Extinction, Massive Stars, Stellar Luminosity, Variable Stars, Astronomical Catalogs, Early Stars, Stellar Evolution, Stellar Spectrophotometry, Stellar Temperature, Wolf-Rayet Stars
Scientific paper
Stars of V less than about 13.5 in the region close to the Luminous Blue Variable AG Car (within 17 arcmin) have been studied in the Walraven photometric system. The observed colors are used to derive the values of Teff and log g. The intrinsic colors, predicted by model atmospheres, and the absolute visual magnitudes, predicted by stellar evolutionary tracks, are used to derive the extinction and the distances of 43 stars. We find a concentration of early type stars in the direction of AG Car with distances between 1 and 10 kpc and E(B - V) in the range of 0.13 to 0.68. The extinction versus distance relation suggests a distance of 4 to 10 kpc for AG Car. Combining all distance criteria for AG Car, we find a distance of 6 +/- 1 kpc, and Mbol = -10.8 +/- 0.4 mag with variable M(v). AG Car does not belong to the Car OB1 or OB2 associations at 2.5 kpc. We did not find a cluster of luminous stars at the distance of AG Car, but we identified a few stars which may belong to the same cluster as AG Car.
Hoekzema Nick M.
Lamers Henny J. G. L. M.
van Genderen Arnout M.
No associations
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