Volume 415, Number 1, February III 2004
|Page(s)||289 - 297|
|Section||Stellar structure and evolution|
|Published online||03 February 2004|
Astronomical Institute of the Charles University, V Holešovičkách 2, 180 00 Praha 8, Czech Republic
2 Astronomical Institute, Academy of Sciences of the Czech Republic, 251 65 Ondřejov, Czech Republic e-mail: firstname.lastname@example.org
3 Hvar Observatory, Faculty of Geodesy, Zagreb University, Kačićeva 26, 10000 Zagreb, Croatia e-mail: hbozic,rdomagoj,email@example.com
4 Department of Physics and Astronomy, University of Victoria, Victoria, BC, Canada, V8W 3P6 e-mail: firstname.lastname@example.org; email@example.com
Corresponding author: P. Harmanec, firstname.lastname@example.org
Accepted: 14 October 2003
New photoelectric and observations, secured during August-November of 2002 at two observatories distant in local time are analyzed together with two earlier photometric data sets and all available radial velocities to derive the most accurate ephemeris of the binary and to set limits on its basic physical elements. These observations were obtained as a support for a high-dispersion spectroscopic study, results of which will be published separately. It was found that radial velocities and photometric observations spanning 53 years can be reconciled with the linear ephemeris , where the rms errors of the last digits are given in brackets. Masses of the stars are 1.02 and 0.97 and the binary separation is 4.170 . There is still a large uncertainty in the stellar radii. We also report the discovery of rapid light variations on a time scale of hours seen in the U band light curve and offer a few thoughts on the future investigation of this binary.
Key words: stars: binaries: close / stars: binaries: eclipsing / stars: binaries: spectroscopic / stars: fundamental parameters / stars: individual: ER Vul
© ESO, 2004
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.