The Library
MV Lyrae in low, intermediate, and high states
Tools
Tools
Tools
Linnell, Albert P., Szkody, Paula, Gaensicke, B. T. (Boris T.), Long, Knox S., Sion, Edward M., Hoard, D. W. (Donald Wayne) and Hubeny, Ivan (2005) MV Lyrae in low, intermediate, and high states. Astrophysical Journal, Volume 624 (Number 2 Part 1). pp. 923-933. doi:10.1086/429143 ISSN 0004-637X.
Research output not available from this repository.
Request-a-Copy directly from author or use local Library Get it For Me service.
Official URL: http://iopscience.iop.org/0004-637X/624/2/923/full...
Abstract
Archival IUE spectra of the VY Sculptoris system MV Lyrae, taken during an intermediate state, can be best fit by an isothermal accretion disk extending half-way to the tidal cutoff radius. In contrast, a recent HST spectrum, while MV Lyr was in a high state, can be best fit with a standard T( R) profile for an accretion disk extending from an inner truncation radius to an intermediate radius with an isothermal accretion disk beyond. These fits use component-star parameters determined from a study of MV Lyr in a low state. Model systems containing accretion disks with standard T( R) profiles have continua that are too blue. The observed high-state absorption-line spectrum exhibits excitation higher than provided by the T( R) profile, indicating likely line formation in a high-temperature region extending vertically above the accretion disk. The absorption lines show a blueshift and line broadening corresponding to formation in a low-velocity wind apparently coextensive with the high-temperature region. Lines of N v, Si IV, C IV, and He II are anomalously strong relative to our synthetic spectra, indicating possible composition effects, but unmodeled excitation effects could also produce the anomalies. An analysis of a low state of MV Lyr, considered in an earlier study and extended in this paper, sets a limit of 2500 K for the T-eff of an accretion disk that may be present in the low state. This limit is in conflict with two recent models of the VY Sculptoris phenomenon.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QB Astronomy | ||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Journal or Publication Title: | Astrophysical Journal | ||||
| Publisher: | IOP Publishing | ||||
| ISSN: | 0004-637X | ||||
| Official Date: | May 2005 | ||||
| Dates: |
|
||||
| Volume: | Volume 624 | ||||
| Number: | Number 2 Part 1 | ||||
| Number of Pages: | 11 | ||||
| Page Range: | pp. 923-933 | ||||
| DOI: | 10.1086/429143 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
Data sourced from Thomson Reuters' Web of Knowledge
Request changes or add full text files to a record
Repository staff actions (login required)
 |
View Item |
