Warm water vapor envelope in the supergiants α Ori and α Her and its effects on the apparent size from the near-infrared to the mid-infrared

Research output: Contribution to journalConference articlepeer-review

Abstract

We present a possible interpretation for the increase of the angular diameter of the supergiants α Ori and α Her from the K band to the 11 μm region revealed by the recent interferometric observations using narrow band-passes where no salient spectral feature is present (Weiner et al. 2003a). Our simple model for the warm water vapor envelope can reproduce the angular diameters observed with Infrared Spatial Interferometer as well as the high-resolution TEXES spectra obtained in the 11 μm region. The warm water vapor layers are optically thick in the lines, and therefore, strong absorption due to H2O can be expected from such a dense water vapor envelope. However, the absorption lines are filled in by emission from the extended part of the envelope, and this results in the high-resolution 11 μm spectra which exhibit only weak, fine spectral features, masking the spectroscopic fingerprints of the dense, warm water vapor envelope. On the other hand, the presence of the warm water vapor envelope manifests itself as the larger angular diameters in the 11 μm region as compared to those measured in the near-infrared.

Original languageEnglish
Pages (from-to)849-852
Number of pages4
JournalEuropean Space Agency, (Special Publication) ESA SP
Issue number560 II
Publication statusPublished - 2005
Externally publishedYes
Event13th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun - Hamburg, Germany
Duration: 5 Jul 20049 Jul 2004

Keywords

  • Infrared: stars
  • Molecular processes
  • Stars: individual: α Ori, α Her
  • Stars: late-type
  • Stars: supergiants
  • Techniques: interferometric

ASJC Scopus subject areas

  • Aerospace Engineering
  • Space and Planetary Science

Fingerprint

Dive into the research topics of 'Warm water vapor envelope in the supergiants α Ori and α Her and its effects on the apparent size from the near-infrared to the mid-infrared'. Together they form a unique fingerprint.

Cite this