edu.ucar.opensky::articles:12660 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-26T03:48:35.584809 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7rv0pj1 The massive eclipsing system ALS 1135 and variable stars in the field of the distant OB association Bochum 7 2013-02-21T00:00:00Z publication https://n2t.org/ark:/85065/d7rv0pj1 https://doi.org/10.1093/mnras/sts419 Michalska, G. author Niemczura, E. author Pigulski, A. author Steslicki, Marek author Williams, A. author UCAR/NCAR - Library publisher Using photometric and spectroscopic observations of the double-lined early-type eclipsing binary system ALS 1135, a member of the distant OB association Bochum 7, we derived the new physical and orbital parameters of its components. The masses of both components were derived with an accuracy better than 1 per cent, and their radii, with an accuracy better than 3 per cent. Since the primary's mass is equal to about 25M, its radius was subsequently used to derive the age of the system which is equal to 4.3 ± 0.5Myr. The result shows that this method represents a viable alternative to isochrone fitting. A photometric search of the field of ALS 1135 resulted in the discovery of 17 variable stars, including 7 pulsating ones. One of them is a slowly-pulsating B (SPB) star belonging to Vel OB1, the other six are δ Scuti stars. Of the six δ Scuti stars three might belong to Vel OB1, the other two are likely members of Bochum 7. Given the age of Bochum 7, these two stars are probably pre-main-sequence pulsators. In addition, we provide UBVIC photometry for about 600 stars in the observed field. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright 2013 Authors. Published under license by John Wiley & Sons for the Royal Meteorological Society. The definitive version is available at http://onlinelibrary.wiley.com. None eng geoscientificInformation