1998A&A...338...91A

Query : 1998A&A...338...91A

1998A&A...338...91A - Astronomy and Astrophysics, volume 33891-96 (1998/10-1)

Search for cool circumstellar matter in the Ursae Majoris group with ISO.

ABRAHAM P., LEINERT C., BURKERT A., LEMKE D. and HENNING T.

Abstract (from CDS):

We observed the mid- and far-infrared spectral energy distributions of 9 A-type stars from the 300Myrs old Ursae Majoris group using the ISO satellite and the UKIRT telescope. We found that only 1 out of the 9 stars shows clear signature of circumstellar dust, and we derived an upper limit of 0.05Mmoon for the dust mass around the other stars. Our results suggest that the relatively high incidence of Vega-like disks observed among A-type field stars in the solar neighbourhood by IRAS cannot be extrapolated to the rest of the Milky Way. The Vega phenomenon appears to be the exception rather than the rule.

Abstract Copyright: ∼

Journal keyword(s): circumstellar matter - stars: individual: β UMa - infrared: stars

Simbad objects: 14

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Number of rows : 14
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 HD 15144 a2* 02 26 00.3479612520 -15 20 28.495226652 6.06 5.97 5.83 5.71 5.67 A3VpSrCrEu 185 0
2 HD 18778 SB* 03 11 42.6740794488 +81 28 14.559645900   6.069 5.907     A7III-IV 91 1
3 * bet Pic PM* 05 47 17.0876901 -51 03 59.441135 4.13 4.03 3.86 3.74 3.58 A6V 2087 1
4 * rho UMa V* 09 02 32.6914772184 +67 37 46.622818272 8.17 6.29 4.76 3.29 2.03 M3IIICa1 99 0
5 * bet UMa PM* 11 01 50.4797515135 +56 22 56.761138187 2.35 2.35 2.37 2.31 2.35 A1IVps 462 0
6 * gam UMa Em* 11 53 49.8473166 +53 41 41.135025 2.440 2.450 2.440 2.44 2.47 A0V 417 0
7 * del UMa PM* 12 15 25.5598467041 +57 01 57.421119850 3.460 3.410 3.320 3.25 3.25 A2Vn 312 0
8 NAME Ursa Major Moving Group MGr 12 32 +57.0           ~ 467 1
9 * eps UMa a2* 12 54 01.7495922 +55 57 35.362645 1.76 1.75 1.77 1.79 1.82 A1III-IVpkB9 488 0
10 * g UMa ** 13 25 13.5378333 +54 59 16.654781 4.260 4.180 4.010 3.85 3.78 A5V+M3-4V 318 0
11 * 52 Her a2* 16 49 14.21821 +45 58 59.9620   4.914 4.823     A1VpSiSrCr 267 0
12 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0V 2787 1
13 * 32 Aqr SB* 22 04 47.4224193480 -00 54 22.839762708   5.519 5.271     A5IV 185 0
14 * alf PsA PM* 22 57 39.04625 -29 37 20.0533 1.31 1.25 1.16 1.11 1.09 A4V 1303 3

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