Unit:
Κατεύθυνση Αστροφυσική, Αστρονομία και Μηχανική (ΒΑΣΙΚΗ ΦΥΣΙΚΗ)Library of the School of Science
Author:
Κουρνιώτης Μιχαήλ
Supervisors info:
Δρ. Δέσποινα Χατζηδημητρίου – Αναπληρ. Καθηγήτρια (Επιβλέπουσα Καθηγήτρια) , Δρ. Άλκηστις Μπονάνου – Εντετ. Ερευνήτρια Εθνικού Αστεροσκοπείου Αθηνών , Δρ. Ευγενία Αντωνοπούλου – Επίκουρη Καθηγήτρια
Original Title:
Μεταβλητότητα Αστέρων Μεγάλης Μάζας στο Μικρό Νέφος του Μαγγελάνου
Translated title:
Variability of Massive Stars in the Small Magellanic Cloud
Summary:
We present a variability study of 4650 massive stars in the Small Magellanic
Cloud (SMC) with known spectral types from the catalog of Bonanos et al. (2010)
using the OGLE-III database. The goal is to systematically study the
photometric properties of a large number of massive stars and to derive
statistics for variability related to their spectral types. Given the precision
of OGLE-III photometry, a total of 2753 stars appear as “constant”. The
remaining 1897 stars exhibit variability distributed as follows: 802 stars show
“low” variability with fluctuations of mean amplitude I 0.05 mag, 471 stars
present higher and irregular variability of which, only 13 are reported in the
General Catalogue of Variable Stars, 190 stars exhibit short term sinusoidal
periodicity (P < 3 days) being strong candidate Slowly Pulsating B stars as
well as non-radial Be pulsators, 56 periodic stars exhibit longer periods, 211
are eclipsing binaries of which, 108 are newly discovered, 124 are classical
Cepheids and 43 are candidate binaries with ellipsoidal modulation. This is the
largest study of the variability of massive stars as a function of their
spectral type, by a factor of 7
Keywords:
Variability, Massive, Small Magellanic Cloud, Eclipsing binaries, Be stars
Number of index pages:
3-4
