Oxygen and carbon rich cool stars in the Cepheus region: classification of selected objects from KP2001 catalogue. I |
| |
| Authors: | C Rossi S Gaudenzi G V Petrosyan R Nesci S Sclavi |
| |
| Institution: | (1) Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-stra e 1, D-85748 Garching, Germany;(2) South African Astronomical Obsevatory, P.O. Box 9, 7935 Observatory, South Africa;(3) Dept. of Physics, University College, ADFA, Canberra, ACT, 2600, Australia;(4) Institut für Astronomie der Universität Wien, Türkenschanzstrae 17, A-1180 Wien, Austria |
| |
| Abstract: | We present moderate resolution CCD spectra and R photometry for seven KP2001 stars. We revised the spectral classification of the stars in the range λλ4000−8700? . Our photometric
data confirmed the behavior of the light curves downloaded from the NSVS (Northern Sky Variability Survey) database. For KP2001-32,
presented as a Mira-type variable in NSVS, we estimated absolute bolometric M
b and K-band M
K
magnitudes as well as the distance using the period-luminosity relations. We also estimated the mass loss rate using the
calibration relations between mass loss rate and K - 12] index. From the position in infrared color-color diagrams, we confirmed the photometric classification of KP2001-221
as a semiregular variable, based on the light curve of the NSVS database. For the N-type carbon star KP2001-77 we estimated
distance and absolute magnitude M
K
using different calibration methods. For the remaining four objects we derived the absolute magnitudes and distances using
our CCD spectra and published JHK
S
magnitudes. We discuss the nature of these objects on the basis of the obtained results. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
