Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/1658
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dc.contributor.authorManoj, P-
dc.contributor.authorBhatt, H. C-
dc.contributor.authorMaheswar, G-
dc.contributor.authorMuneer, S-
dc.date.accessioned2007-06-18T06:40:47Z-
dc.date.available2007-06-18T06:40:47Z-
dc.date.issued2006-12-10-
dc.identifier.citationThe Astrophysical Journal, Vol. 653, pp. 657 - 674en
dc.identifier.urihttp://hdl.handle.net/2248/1658-
dc.description.abstractWe present optical spectra of 45 intermediate-mass Herbig Ae/Be stars. Together with the multiepoch spectroscopic and photometric data compiled for a large sample of these stars and ages estimated for individual stars by using pre–main-sequence evolutionary tracks, we have studied the evolution of emission-line activity in them. We find that, on average, the Hα emission line strength decreases with increasing stellar age in Herbig Ae/Be stars, indicating that the accretion activity gradually declines during the pre–main-sequence phase. This would hint at a relatively long-lived (a few Myr) process being responsible for the cessation of accretion in Herbig Ae/Be stars. We also find that the accretion activity in these stars drops substantially by ∼3 Myr. This is comparable to the timescale in which most intermediate-mass stars are thought to lose their inner disks, suggesting that inner disks in intermediate-mass stars are dissipated rapidly after the accretion activity has fallen below a certain level. We further find a relatively tight correlation between strength of the emission line and near-infrared excess due to inner disks in Herbig Ae/Be stars, indicating that the disks around Herbig Ae/Be stars cannot be entirely passive. We suggest that this correlation can be understood within the framework of the puffed-up inner rim disk models if the radiation from the accretion shock is also responsible for the disk heating.en
dc.format.extent420039 bytes-
dc.format.mimetypeapplication/pdf-
dc.language.isoenen
dc.publisherAmerican Astronomical Societyen
dc.relation.urihttp://lanl.arxiv.org/abs/astro-ph/0608541en
dc.relation.urihttp://www.iop.org/EJ/abstract/0004-637X/653/1/657en
dc.subjectCircumstellar matteren
dc.subjectPlanetary systemsen
dc.subjectProtoplanetary disksen
dc.subjectStars: emission-line, Been
dc.subjectStars: pre-main sequence-
dc.subjectTechniques: spectroscopic-
dc.titleEvolution of emission line activity in intermediate mass young starsen
dc.typeArticleen
Appears in Collections:Publications based on data from IAO, Hanle
IIAP Publications

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