Issue |
A&A
Volume 520, September-October 2010
|
|
---|---|---|
Article Number | A103 | |
Number of page(s) | 17 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361/200913726 | |
Published online | 08 October 2010 |
Spectroscopic analysis of the B/Be visual binary HR 1847 *,**
1
Astronomický ústav, Akademie věd České republiky, 251 65 Ondřejov, Czech Republic e-mail: kubat@sunstel.asu.cas.cz
2
National Research Institute of Astronomy and Geophysics, 11421 Helwan, Cairo, Egypt
3
Institute of Astronomy, Bulgarian Academy of Sciences, 72 Tsarigradsko Shossee Blvd., 1784 Sofia, Bulgaria
4
Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot, CEA, IRFU, SAp, Centre de Saclay, 91191 Gif-sur-Yvette, France
5
Astronomický ústav, Akademie věd České republiky, Boční II 1401, 141 31 Praha 4, Czech Republic
6
Ústav teoretické fyziky a astrofyziky PřF MU, Kotlářská 2, 611 37 Brno, Czech Republic
Received:
24
November
2009
Accepted:
22
May
2010
We studied both components of a slightly overlooked visual binary HR 1847 spectroscopically to determine its basic physical and orbital parameters. Basic stellar parameters were determined by comparing synthetic spectra to the observed echelle spectra, which cover both the optical and near-IR regions. New observations of this system used the Ondřejov and Rozhen 2-m telescopes and their coudé spectrographs. Radial velocities from individual spectra were measured and then analysed with the code FOTEL to determine orbital parameters. The spectroscopic orbit of HR 1847A is presented for the first time. It is a single-lined spectroscopic binary with a B-type primary, a period of 719.79 days, and a highly eccentric orbit with e=0.7. We confirmed that HR 1847B is a Be star. Its Hα emission significantly decreased from 2003 to 2008. Both components have a spectral type B7-8 and luminosity class IV-V.
Key words: binaries: general / stars: emission-line, Be / stars: individual: HR 1847
Appendix is only available in electronic form at http://www.aanda.org
© ESO, 2010
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.