2003A&A...404..579P


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.27CET04:18:47

2003A&A...404..579P - Astronomy and Astrophysics, volume 404, 579-591 (2003/6-3)

A study of λ Bootis type stars in the wavelength region beyond 7000Å.

PAUNZEN E., KAMP I., WEISS W.W. and WIESEMEYER H.

Abstract (from CDS):

The group of λ Bootis type stars comprises late B- to early F-type, PopulationI objects which are basically metal weak, in particular the Fe group elements, but with the clear exception of C, N, O and S. One of the theories to explain the abundance pattern of these stars involves circumstellar or interstellar matter around the objects. Hence, we have compiled all available data from the literature of well established members of the λ Bootis group redward of 7000Å in order to find evidence for matter around these objects. Furthermore, we present unpublished ISO as well as submillimeter continuum and CO (2-1) line measurements to complete the data set. In total, measurements for 34 (26 with data redward of 20µm) well established λ Bootis stars are available. There is evidence for an infrared excesses in six stars (HD 31295, HD 74873, HD 110411, HD 125162, HD 198160/1 and HD 210111) and two are doubtful cases (HD 11413 and HD 192640) resulting in a percentage of 23% (excluding the two doubtful cases). Dust models for these objects show fractional dust luminosities comparable to the Vega-type stars and slightly higher dust temperatures. ISO-SWS spectroscopy for HD 125162 and HD 192640 resulted in the detection of pure stellar Hi lines ruling out an active accretion disk (as found for several Herbig Ae/Be stars) around these objects. The submillimeter measurements gave only upper limits for the line and continuum fluxes.

Abstract Copyright:

Journal keyword(s): stars: chemically peculiar - stars: early-type

Simbad objects: 20

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Number of rows : 20

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 319 PM* 00 07 46.9004138978 -22 30 30.805804687   6.055 5.923     A1VbmA2_lB 97 0
2 V* BD Phe dS* 01 50 54.4351104603 -50 12 22.093636860   6.080 5.929     F0VkA2mA2_lB 97 0
3 * eps Eri BY* 03 32 55.8449634 -09 27 29.731165 5.19 4.61 3.73 3.00 2.54 K2V 1713 1
4 * pi.01 Ori PM* 04 54 53.7287660 +10 09 02.995200   4.723 4.648     A0Va_lB 242 0
5 * bet Pic PM* 05 47 17.0876901 -51 03 59.441135 4.13 4.03 3.86 3.74 3.58 A6V 1669 1
6 * 50 Cnc PM* 08 46 56.0191877567 +12 06 35.830526746   5.992 5.885 7.20 5.76 A1Vp 82 0
7 * rho Vir dS* 12 41 53.0567802922 +10 14 08.229084878 5.00 4.97 4.88 4.80 4.78 A0Va_lB 210 0
8 * lam Boo dS* 14 16 23.0187965 +46 05 17.900526 4.31 4.26 4.18 4.16 4.13 A0Va_lB 327 0
9 V* HR Lib dS* 15 56 33.3735361896 -14 49 45.972376397   6.345 6.117     A2Ib/II 106 0
10 V* IN Lup dS* 15 59 10.9040173976 -38 44 54.940579221   7.46 7.17     F2VkA3mA3_lB? 46 0
11 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0Va 2521 0
12 * c Aql dS* 19 29 00.9870438377 +01 57 01.618441082   5.865 5.783     A0IVp 166 0
13 * b03 Cyg dS* 20 14 32.0319919055 +36 48 22.684605093 5.10 5.11 4.99 4.79 4.72 A2V 242 0
14 HD 193256 * 20 20 26.5741252340 -29 11 28.761537820   7.703 7.525 8.49   A8VnkA3mA3(_lB) 62 0
15 HD 193281 * 20 20 27.8805474206 -29 11 49.975108388   6.76 6.64 7.50   A2IV-V 91 0
16 CD-62 1338A PM* 20 51 38.5079641449 -62 25 45.594366275   6.35 6.21 6.55   A3IV(n) 69 0
17 HD 204041 PM* 21 25 51.5846178730 +00 32 03.619939380   6.593 6.450     A1Vb 95 0
18 HD 210111 dS* 22 08 42.6438955365 -33 07 32.498239929   6.564 6.386     A9VkA2mA2_lB 73 0
19 * alf PsA ** 22 57 39.04625 -29 37 20.0533 1.31 1.25 1.16 1.11 1.09 A4V 1126 3
20 * 15 And dS* 23 34 37.5365247800 +40 14 11.179472901   5.652 5.563 6.91   A1Va 127 0

    Equat.    Gal    SGal    Ecl

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2020.10.27-04:18:47

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