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

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

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004a%26a...427..937m&link_type=abstract

Astronomy and Astrophysics, v.427, p.937-944 (2004)

Astronomy and Astrophysics

Astrophysics

6

Techniques: Spectroscopic, Techniques: Photometric, Stars: Circumstellar Matter, Stars: Individual: Hd 35929

Scientific paper

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 IV 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&sun;=1.7±0.2, v sin i =70±5 km s-1, M=2.3±0.2 M&sun;, 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. (\cite{marc00}) 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. \cite{mir03}). These objects might represent a group of evolved intermediate-mass stars with an enhanced mass loss.

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