A search for circumstellar material around B-type stars in the Galactic halo

Francis Keenan, H.R.M. Magee, W.R.J. Rolleston, C.J. Mooney, Philip Dufton

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

19 B-type stars, selected from the Palomar-Green Survey, have been observed at infrared wavelengths to search for possible infrared excesses, as part of an ongoing programme to investigate the nature of early-type stars at high Galactic latitudes. The resulting infrared fluxes, along with Stromgren photometry, are compared with theoretical flux profiles to determine whether any of the targets show evidence of circumstellar material, which may be indicative of post-main- sequence evolution. Eighteen of the targets have flux distributions in good agreement with theoretical predictions. However, one star, PG 2120 + 062, shows a small near-infrared excess, which may be due either to a cool companion of spectral type F5-F7, or to circumstellar material, indicating that it may be an evolved object such as a post-asymptotic giant branch star, in the transition region between the asymptotic giant branch and planetary nebula phase, with the infrared excess due to recent mass loss during giant branch evolution.
Original languageEnglish
Pages (from-to)1147-1154
Number of pages8
JournalMonthly Notices of the Royal Astronomical Society
Volume336
Issue number4
Publication statusPublished - 11 Nov 2002

ASJC Scopus subject areas

  • Space and Planetary Science

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