Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...457..581g&link_type=abstract
Astronomy and Astrophysics, Volume 457, Issue 2, 2006, pp.581-589
Astronomy and Astrophysics
Astrophysics
24
Stars: Pre-Main Sequence, Stars: Activity, Techniques: Spectroscopic, Accretion, Accretion Disks
Scientific paper
Aims.We investigate evidence of accretion in a sample of 15 Herbig Ae/Be stars to determine whether these events originate in a remnant gaseous structure from the primordial cloud (rich in hydrogen) or in a metal-rich body (like comets in our Solar System). During such analysis we also determine precise stellar parameters for this sample of stars. Methods: The stars were observed using high resolution spectroscopy (R = 48 000). A synthetic photospheric spectrum was constructed and then subtracted from the observed one to obtain the circumstellar component. An iterative procedure was applied to find the stellar parameters that were used to build the synthetic photospheric spectrum. Results: Evidence of circumstellar activity were found in four stars: HD 100546, HD 142666, HD 144432 and HD 145718. The presence of redshifted absorption features only in the Balmer lines implies that the accreting material is hydrogen-rich, excluding the possibility that the accretion events might have been created by comet-like bodies. We determined effective temperature, surface gravity, metallicity and the projected rotational velocity for the stars in our sample.
Alencar Silvia H. P.
Corradi J. B. W.
Guimaraes Marcelo Medeiros
Vieira L. A. S.
No associations
LandOfFree
Stellar parameters and evidence of circumstellar activity for a sample of Herbig Ae/Be stars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Stellar parameters and evidence of circumstellar activity for a sample of Herbig Ae/Be stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stellar parameters and evidence of circumstellar activity for a sample of Herbig Ae/Be stars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-867852