Volume 376, Number 3, September IV 2001
|Page(s)||1031 - 1038|
|Section||Interstellar and circumstellar matter|
|Published online||15 September 2001|
BZ Camelopardalis during its 1999/2000 optical low state
Astrophysical Institute Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany
2 OAN, Instituto de Astronomía, UNAM, AP 877, 22860 Ensenada, México
3 Osservatorio Astronomico di Torino, Strada Osservatorio 20, 10125 Pino Torinese (TO), Italy
4 Dept. of Astronomy, Univ. Wisconsin, 1150 University Ave., Madison, WI 53706, USA
5 Thüringer Landessternwarte, Sternwarte 5, 07778 Tautenburg, Germany
6 Instituto Nacional de Astrofisica, Optica y Electronica (INAOE), Aptdo. Postal 51 y 216, 72000 Puebla, Pue., Mexico
Corresponding author: J. Greiner, email@example.com
Accepted: 16 July 2001
We report optical observations of the VY Scl star BZ Cam during its previous optical low state in 1999/2000. We find drastic variations in the line profiles. Narrow-band imaging observations show that its nebula extends farther than previously known and seems to be composed of two components. We determine the [ OIII] line intensity of BZ Cam's nebula to erg/cm2/s. We discover a proper motion of BZ Cam of mas/yr which together with the systemic radial velocity yields a space velocity of 125 km s-1. We re-interpret the nebula as being photo-ionized by hypothesized transient, luminous, supersoft X-ray emission during optical low states, and shaped by the transverse motion of BZ Cam.
Key words: X-ray: stars / binaries: close / reflection nebulae / stars: individual: BZ Cam, RX J0513.9-6951, CAL 83
© ESO, 2001
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