Archive for July, 2017

Only on the second day of my arrival in Chile (Jan 13, 2017) I found myself traveling from Valparaiso to Santiago to go to the Universidad Catolica Observatory (long title: Pontificia Universidad Católica de Chile), for spectroscopic observations (of bright Be stars). It is located about 50-60km from Santiago at an altitude of 1450m (and […]

Planets around A-type stars

By grigoris | Filed in Astronomy

For an unknown reason I found this footnote from Menu et al. 2015 (A&A, 581A, 107) very interesting: It is interesting to note that several of the few directly imaged planetary companions are found around A-type stars, which are descendants of Herbig Ae/Be stars. Examples of A-type exoplanet host stars are HR 8799 (e.g., Marois […]

The (paper-)story of HD 87643

By grigoris | Filed in Astronomy

A summary for HD 87643 (or MWC 198, Hen 3-365, V640 Car, … see also Simbad). That is a great number of papers (similar to the post for GG Car). 1909 / Object of the Henry Draper catalog. 1933 / Merrill, P. W.; Burwell, C. G. 1933 (ApJ, 78, 87) First reference as a Be […]

A novel method to automatically detect and measure the ages of star clusters in nearby galaxies: Application to the Large Magellanic Cloud T. Bitsakis, P. Bonfini, R. A. Gonzalez-Lopezlira, V. H. Ramirez-Siordia, G. Bruzual, S. Charlot, G. Maravelias, D. Zaritsky We present our new, fully-automated method to detect and measure the ages of star clusters […]