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HD 73811


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An Einstein Observatory SAO-based catalog of B-type stars
About 4000 X-ray images obtained with the Einstein Observatory are usedto measure the 0.16-4.0 keV emission from 1545 B-type SAO stars fallingin the about 10 percent of the sky surveyed with the IPC. Seventy-fourdetected X-ray sources with B-type stars are identified, and it isestimated that no more than 15 can be misidentified. Upper limits to theX-ray emission of the remaining stars are presented. In addition tosummarizing the X-ray measurements and giving other relevant opticaldata, the present extensive catalog discusses the reduction process andanalyzes selection effects associated with both SAO catalog completenessand IPC target selection procedures. It is concluded that X-rayemission, at the level of Lx not less than 10 exp 30 ergs/s, is quitecommon in B stars of early spectral types (B0-B3), regardless ofluminosity class, but that emission, at the same level, becomes lesscommon, or nonexistent, in later B-type stars.

The VELA star cloud. III - The B8 to A0 stars and interstellar reddening
The present discussion of intermediate band and H-beta observations of360 HD stars B8-A0 in Vela, and all of the CPD stars in a small adjacentregion, notes that the interstellar absorption in both cases can beunderstood as a combination of three absorbing clouds of 1 kpc-A(V) =1.5, 0.5, and 0.17. The major difference in the two environments is thepresence of numerous T Tauri stars in Taurus. Several clusters in theVela region are discussed.

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Dades d'Observació i Astrometria

Constel·lació:Vela
Ascensió Recta:08h38m40.45s
Declinació:-42°26'49.1"
Magnitud Aparent:8.226
Distancia:943.396 parsecs
Moviment propi RA:-3.4
Moviment propi Dec:5.7
B-T magnitude:8.225
V-T magnitude:8.226

Catàlegs i designacions:
Noms Propis   (Edit)
HD 1989HD 73811
TYCHO-2 2000TYC 7670-1138-1
USNO-A2.0USNO-A2 0450-07245516
HIPHIP 42395

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