AGB candidates in the field of gamma Cas

التفاصيل البيبلوغرافية
العنوان: AGB candidates in the field of gamma Cas
المؤلفون: Nesci, Roberto, Tuvikene, Taavi, Rossi, Corinne, Gaudenzi, Silvia, Galleti, Silvia, Ochner, Paolo, Enke, Harry
سنة النشر: 2018
المجموعة: Astrophysics
مصطلحات موضوعية: Astrophysics - Solar and Stellar Astrophysics
الوصف: We report the spectroscopic and photometric monitoring of a sample of 530 candidate AGB stars in a 5 degrees field, selected from the IPHAS catalog: historic light curves were derived from Asiago IR plates taken in the years 1965 -1984. We found 10 Miras, 5 stars with long term trends, 3 semiregular and 3 irregular. Spectral types from CCD slit spectra gave 8 M-type, 7 C-type and 6 S-type stars. In the color-color plots made from IPHAS and 2MASS catalogs, the S-type and M-type stars occupy the same regions, while C-type stars are well separated. All C-type stars with IR excess showed long term trends in their light curve. Distances of the Mira stars, estimated from their periods and K magnitudes, gave a median value of 4.9 kpc with a large spread. A comparison with astrometric parallaxes from Gaia DR2 is briefly discussed.
Comment: accepted for publication on Revista Mexicana de Astronomia Y Astrofisica, 24 pages, 9 figures
نوع الوثيقة: Working Paper
URL الوصول: http://arxiv.org/abs/1805.09191
رقم الأكسشن: edsarx.1805.09191
قاعدة البيانات: arXiv