Photometric studies of stars in ORI OB1 /belt/

Abstract

view Abstract Citations (20) References (25) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Photometric studies of stars in ORI OB1 (belt). Guetter, H. H. Abstract Intermediate infrared and (V - I) photometry is presented for 14 reddened B- and A-type stars in Ori OBl (Belt). From a color-difference analysis, R (the ratio of total-to-selective absorp- tion) is found to be uniform across the subgroup, and calculated to be 3.1 + 0.2. One star (HD 38087) does exhibit an abnormal reddening law which is probably due to the presence of an optically thin shell of circumstellar material. From UBV observations for 152 B- and A-type stars with no prior available three-color photometry, and existing UB V photometry for 203 additional B- and A-type stars, a variation in distance moduli of 0 .2 + Orn. 1 is observed be- tween the stars in the Eastern part and those in the remainder of the Belt. The resultant H-R diagram shows that stars with (B - V)0 + 0 .3 still follow the ZAMS, which implies an age of at least 15>c 106 years. As the brighter stars must be much younger, this indicates that star formation in Ori OB1 (Belt) was a continuous process. From the ZAMS fitting method, an intrinsic distance modulus of 8rn.3 + 0 .4 is derived. Publication: The Astronomical Journal Pub Date: December 1979 DOI: 10.1086/112616 Bibcode: 1979AJ.....84.1846G Keywords: Early Stars; Infrared Astronomy; Orion Constellation; Stellar Spectrophotometry; A Stars; Astronomical Catalogs; B Stars; Colorimetry; Interstellar Extinction; Ubv Spectra; Astronomy full text sources ADS | data products SIMBAD (176) GCPD (1)