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uvby - β Photoelectric Photometry of the Open Cluster α Per
Absolute photoelectric photometry of stars in the direction of the OpenCluster α Per has been secured and is presented along with ananalysis reinforced with all the available data in Strömgrenuvby-β photometry compiled from the literature. Cluster membershipis analyzed and the physical characteristics of the stars have beendeduced. The membership determined in this paper is compared with thatof proper motion studies and Hipparcos.
| Starbursts, binary stars, and blue stragglers in local superclusters and groups. I - The very young disk and young disk populations
The distributions in the HR diagram with theoretical time-constant locifor stars in several young clusters and superclusters are compared todemonstrate that 'blue stragglers' in these aggregates are mostfrequently simply single massive (mode B) stars formed in bursts of starformation that occur at discrete intervals in time following theformation of the bulk of the low-mass (mode A) stars in the aggregate.The characteristics of the close binary systems in these aggregates areexamined to show that, in several cases, mass transfer by Roche lobeoverflow has or will occur and that, in some instances, the system wouldhave appeared as a blue straggler prior to the mass-transfer event, and,in other instances, mass transfer will lead to the identification of thesystem as a blue straggler. Thus, it is concluded that the bluestraggler phenomenon has at least two distinct physical origins: it mayoriginate from delayed formation (starbursts) or from 'delayedevolution' in some close binaries (mass transfer from an evolvedprimary).
| Radial velocity measurements. II - Ground-based observations of the program stars for the HIPPARCOS satellite
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| Eigenbewegungen in der Umgebung von α Persei
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Membre dels grups següents:
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Dades d'Observació i Astrometria
| Constel·lació: | Perseus |
| Ascensió Recta: | 03h40m08.86s |
| Declinació: | +48°57'27.8" |
| Magnitud Aparent: | 8.154 |
| Distancia: | 381.679 parsecs |
| Moviment propi RA: | -3.8 |
| Moviment propi Dec: | -1.6 |
| B-T magnitude: | 8.357 |
| V-T magnitude: | 8.171 |
Catàlegs i designacions:
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