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Kinematics of M-Type Giant Semi-Regular Variables from the Hipparcos Catalogue
C.
Yeşilyaprak A C,
Z.
Aslan B
A
Atatürk University, Art & Science Faculty, Physics Department, 25240, Erzurum, Turkey
B
İstanbul Kültür University, Art & Science Faculty, Physics Department, 34510, İstanbul, Turkey
C
Corresponding author. Email: cahity@atauni.edu.tr
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Publications of the Astronomical Society of Australia 25(2) 63–68 http://dx.doi.org/10.1071/AS07015
Submitted: 1 May 2007
Accepted: 14 April 2008
Published online: 26 June 2008
Abstract
The kinematics of M-type (O-rich) giant semi-regular (SR) variable stars were examined. They were grouped with respect to their relative parallax errors (επ/π) in order to study the stars having relatively better parallax, and with the period limit (70 d). The spatial and velocity distributions were examined and the results were compared with the results of irregular (L) and Mira-type variables. It was found that M-type giant SR variables are distributed similarly to thin-disc stars and form a kinematically homogeneous group. When the kinematic properties of M-type giant SR variables were compared with those of L- and Mira-type variables, it was estimated that M-type giant SR variables behave as old-disc objects and their kinematic ages vary approximately between 2 and 9 Gyr.
Keywords:
stars: distances — stars: late-type — stars: kinematics — stars: evolution
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