Forum Springer Astron. Astrophys.
Forum Whats New Search Orders

Astron. Astrophys. 346, 134-138 (1999)

Previous Section Next Section Title Page Table of Contents

1. Introduction

HR 1960 (HD 37935, HIP 26368) is a late B-type star classified B9.5Ve in SIMBAD (Centre de Donnes Astronomiques de Strasbourg, CDS) and in the Bright Star Catalogue (Hoffleit & Jaschek, 1982) according to the selection made by Mercedes Jaschek. In the Michigan Catalogue (Houk & Cowley, 1975), the spectral type is B9.5V. Spectra taken in 1998 at the New Swiss Telescope (120 cm) at the E.S.O. La Silla Observatory confirms the Be character of HR 1960.

The star was declared constant by Balona et al. (1992) and was used as a comparison star to analyse the variability of HD 269858 (Sterken et al., 1993) and SN 1987A (Burki et al., 1989, 1991). The star was also found constant in the Hipparcos Catalogue (ESA, 1997), the standard deviation of the photometric measurements of good quality (quality flag equal to 0) being 0.006. In radial velocity, HR 1960 was also declared constant by Andersen & Nordström (1983), although a variability with a period longer than 100 days cannot be ruled out (see Sect. 5).

In this paper, the variability of HR 1960 is described using the photometric data resulting from the surveys in the Geneva system from December 1982 to January 1998 and by the Hipparcos satellite from November 1989 to March 1993. HR 1960 appears to be a new variable periodic Be star, characterized by a period of about 395 days and a very small semi-amplitude, i.e. 3 millimags.

Previous Section Next Section Title Page Table of Contents

© European Southern Observatory (ESO) 1999

Online publication: May 6, 1999