The star-grazing extrasolar comets in the HD 100546 system

被引：62

作者：

Grady, CA

Sitko, ML

Bjorkman, KS

Perez, MR

Lynch, DK

Russell, RW

Hanner, MS

机构：

[1] UNIV CINCINNATI, DEPT PHYS, CINCINNATI, OH 45221 USA

[2] UNIV TOLEDO, DEPT PHYS & ASTRON, TOLEDO, OH 43606 USA

[3] APPL RES CORP, LANDOVER, MD 20785 USA

[4] AEROSP CORP, LOS ANGELES, CA 90009 USA

[5] CALTECH, JET PROP LAB, PASADENA, CA 91109 USA

来源：

ASTROPHYSICAL JOURNAL | 1997年 / 483卷 / 01期

关键词：

circumstellar matter; planetary systems; stars; individual; (HD; 100546); pre-main-sequence; ultraviolet;

D O I：

10.1086/304230

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Redshifted absorption profiles that resemble the high-velocity circumstellar gas features in the spectrum of beta Pictoris have been detected in IUE data for the 10 Myr old Herbig Be star, HD 100546, on 1995 March 7. In addition to Mg II, Si II, and other refractory species similar to those seen in beta Pic, the HD 100546 spectra are rich in accreting gas profiles from neutral atomic gas, including C I and O I, as well as mildly refractory species such as Zn II and S II. The presence of accreting gas profiles, including neutral atomic gas, is consistent with detection of comae of star-grazing bodies potentially resembling either comets or asteroids. Overall, the IUE data for HD 100546 are consistent with the planetesimals in this system being more volatile-rich and magnesium-rich than similar bodies in the beta Pic system.

引用

页码：449 / 456

页数：8

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