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Oxygen-rich semiregular and irregular variables
All the known oxygen-rich semiregulars and irregulars of spectralclasses K and M with the absolute value of B not greater than 30 deg,Delta(m) not less than 0.5 mag, and, for the semiregulars, periods inthe range of 50 to 400 d are compiled. On the basis of theirdistributions on the sky and their brightnesses in the K band at 2.2microns, it is argued that the semiregulars with a period of 300-400 dappear to belong to the same population as the 'thin disk' Miras in thesame period range and have an exponential scale height from the Galacticplane of about 250 pc. The semiregulars with a period range of 200 to300 d belong to the population of the 'thick disk' Miras with anexponential scale height from the Galactic plane of about 500 pc. On thebasis of the similarities of their space distributions and the presenceof Tc in their atmospheres, and using the pulsational mode calculationsby Ostlie and Cox (1986), it is suggested that the semiregulars with aperiod range of 100-150 d are first and second overtone pulsations ofthe same population of AGB stars as the Miras in their fundamentalpulsational mode with periods longer than 300 d.
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Membro dei seguenti gruppi:
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Osservazione e dati astrometrici
| Costellazione: | Vergine |
| Ascensione retta: | 14h47m03.66s |
| Declinazione: | +04°53'07.7" |
| Magnitudine apparente: | 9.181 |
| Moto proprio RA: | 3 |
| Moto proprio Dec: | -1.3 |
| B-T magnitude: | 10.775 |
| V-T magnitude: | 9.313 |
Cataloghi e designazioni:
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INHABITED SKY
