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Fundamental parameters and evolutionary state of the Herbig Ae star candidate HD 35929

UNCG Author/Contributor (non-UNCG co-authors, if there are any, appear on document)
Anatoly S. Miroshnichenko, Associate Professor (Creator)
The University of North Carolina at Greensboro (UNCG )
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Abstract: HD 35929 is a pre-main-sequence Herbig Ae star candidate that exhibits emission in the Hα line and a weak IR excess. Although its luminosity type was estimated as TV from low-resolution spectroscopy, the insignificant HIPPARCOS parallax (0.88 ± 0.93 mas) contradicted the low luminosity. To resolve this discrepancy, we took 3 high-resolution optical spectra of the star (region 5200–6915 Å, R ~ 60 000) and used an archival one (4000–6800 Å, R ~ 48 000). Our analysis of the spectral and photometric information shows that HD 35929 is an F2 III star with Teff = 6880 ± 100 K, log g = 3.3 ± 0.1, log L/L⨀ = 1.7 ± 0.2, v sin i = 70 ± 5 km s-1, M = 2.3 ± 0.2 M⨀, a mild metal deficit [Fe/H] = -0.2 ± 0. 1, and a weak interstellar reddening (AV ~ 0.1 mag) at a distance D = 345 ± 60 pc. These results confirm an earlier suggestion by Marconi et al. (2000) that HD 35929 is located within the instability strip. At the same time, we argue that it is not a young object, but rather a post-main-sequence giant. The fundamental parameters and IR excess of HD 35929 are similar to those of HD 19993, an emission-line late A-type giant recently discovered by us (Miroshnichenko et al. 2003). These objects might represent a group of evolved intermediate-mass stars with an enhanced mass loss.

Additional Information

Miroshnichenko, A.S., Gray, R.O., Klochkova, V.G., Bjorkman, K.S., Kuratov, K.S. 2004. A&A, 427, 937-944. Fundamental Parameters and Evolutionary State of the Herbig Ae Star Candidate HD 35929.
Language: English
Date: 2004
Techniques: spectroscopic, Techniques: photometric, Stars: circumstellar matter, Stars: individual: HD 35929