2001A&A...373..633P


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.29CET00:53:41

2001A&A...373..633P - Astronomy and Astrophysics, volume 373, 633-640 (2001/7-2)

A spectroscopic survey for λ Bootis stars. III. Final results.

PAUNZEN E.

Abstract (from CDS):

In the third paper of a series dedicated to the spectroscopic survey for new λ Bootis stars, we present all new and confirmed members of the group as well as a detailed analysis of the observed sample. The nature of this small group of chemically peculiar stars of the upper main sequence still challenges our understanding of processes like diffusion, mass-loss and accretion. The typical abundances pattern (nearly solar values for C, N, O and S whereas the Fe-peak elements are moderate to strong underabundant) can still not be explained by any proposed theory. Hence, the significant increase of new members gives the opportunity to investigate the group properties in more detail. We report the discovery of 26 new members of the group and the confirmation of 18 candidates from the literature. This almost triples the number of known λ Bootis stars. The existence of one member in the young open cluster NGC 2264 and four members in the Orion OB1 association proves that the λ Bootis phenomenon already works at very early stages of stellar evolution. Recent results from the Hipparcos mission have shown that the well established λ Bootis stars of the Galactic field comprise the whole area from the Zero Age Main Sequence to the Terminal Age Main Sequence (≃109yr for an A-type star). There is a continuous transition between very young and rather evolved evolutionary stages. We find that the overall percentage of λ Bootis type among all normal type stars in the spectral range from B8 to F4 is 2% in the Galactic field as well as in open clusters. Furthermore, 44 metal-weak objects are listed which might be connected with the λ Bootis phenomenon. Our biased sample (chosen by photometric boxes) is not distinguished from all A-type stars in the corresponding spectral region by the rotational velocity distribution. Only for the luminosity classes IV and III (especially for the cooler program stars) the determined mean vsini values are very high compared to those of the literature.

Abstract Copyright:

Journal keyword(s): astronomical data bases - surveys - stars: chemically peculiar - stars: early type - stars: fundamental parameters

Simbad objects: 87

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Number of rows : 87

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 HD 319 PM* 00 07 46.9004138978 -22 30 30.805804687   6.055 5.923     A1VbmA2_lB 97 0
2 V* BS Tuc dS* 01 08 03.9684578139 -61 52 17.819432212   7.71 7.45     hF0mA1_lB 90 0
3 HD 7908 * 01 18 25.3735394167 -23 00 47.602319343   7.569 7.302     F0VmA3_lB 44 0
4 HD 10377 * 01 41 52.3331298147 +29 03 59.185810459   8.53 8.37     A2 5 0
5 V* BD Phe dS* 01 50 54.4351104603 -50 12 22.093636860   6.080 5.929     F0VkA2mA2_lB 97 0
6 V* CV Phe dS* 02 12 47.0861323060 -44 29 20.456122360   8.11 7.83     F1VkA8mA8(_lB) 24 0
7 Cl Stock 2 OpC 02 14 43 +59 29.1           ~ 96 0
8 HD 15165 dS* 02 26 45.6479225723 +10 33 55.067355855   6.94 6.69     F0IV 86 0
9 NGC 1039 OpC 02 42 05 +42 45.7           ~ 375 0
10 Cl Melotte 20 OpC 03 26 42 +48 48.0           ~ 761 0
11 HD 23392 * 03 44 32.7249108367 -08 35 12.463543073   8.29 8.24     A0Va-_lB 25 0
12 IC 348 OpC 03 44 34 +32 09.8           ~ 1238 1
13 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 3037 0
14 HD 24472 * 03 52 49.7456105989 -22 16 34.601364438   7.40 7.10     A9V 33 0
15 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2714 0
16 V* EX Eri dS* 04 46 25.7495931083 -28 05 14.805481115   6.347 6.173     A7VkA3mA3 109 0
17 * pi.01 Ori PM* 04 54 53.7287660 +10 09 02.995200   4.723 4.648     A0Va_lB 242 0
18 V* V1649 Ori dS* 05 23 31.0657241182 +05 19 23.115622158   6.455 6.334     hA3VamA1_lB 41 0
19 CCDM J05313-0029AB ** 05 31 18.752 -00 29 24.24   9.47 9.39     A0 20 0
20 HD 36726 * 05 33 51.7276599728 -00 04 36.342169054   8.94 8.85     hA5VkA0mA0_lB 37 1
21 HD 294253 * 05 36 41.7833157594 -03 30 12.473268720   9.68 9.67     A0 26 0
22 NAME Ori I As* 05 38 -02.8           ~ 563 0
23 NGC 2232 OpC 06 27 15 -04 45.5           ~ 133 0
24 NGC 2264 OpC 06 40 58 +09 53.7     3.9     ~ 1606 1
25 HD 261904 Y*O 06 41 00.6866630013 +09 24 11.908313569   10.38 10.3     A0/1 35 0
26 NGC 2301 OpC 06 51 45 +00 27.6   6.30 6.0     ~ 138 0
27 HD 54272 RR* 07 08 53.8545170228 +19 19 38.068439507   9.02 8.77     A5 18 0
28 V* DD Lyn dS* 07 55 40.8263456114 +35 24 45.669980557   6.478 6.221     A3p 65 0
29 NGC 2632 OpC 08 40 24 +19 40.0           ~ 1269 0
30 * 50 Cnc PM* 08 46 56.0191877567 +12 06 35.830526746   5.992 5.885 7.20 5.76 A1Vp 82 0
31 V* HZ Vel dS* 08 49 52.3521085534 -39 08 29.770890153   6.602 6.368     A2/3II/III 65 0
32 HD 81290 Pe* 09 23 02.0653762536 -49 03 30.791826501   9.15 8.89     F4VkA3mA3_lB? 49 0
33 V* AK Ant dS* 09 34 56.5519422925 -28 52 39.330592954   9.10 8.79     F1VkA3mA3_lB? 53 0
34 HD 83277 Pe* 09 36 31.8227093397 -27 57 45.136257201   8.57 8.29     F2VkA3mA3_lB? 38 0
35 HD 84123 PM* 09 44 06.8765461366 +42 03 03.131298842   7.135 6.838     A4III 50 0
36 HD 84948 SB* 09 50 05.8774942991 +49 04 31.750979246   8.42 8.12     F0 49 0
37 V* GM Leo dS* 10 04 08.3785307660 +11 37 42.648804269 7.330 7.310 7.130     A0 34 0
38 HD 90821 * 10 29 37.0987720698 +26 10 58.571898631   9.54 9.45     F0 18 0
39 * 33 LMi * 10 31 51.3746360193 +32 22 46.412107377   6.001 5.905     A0Va- 64 0
40 NGC 3532 OpC 11 05 39 -58 45.2           ~ 270 0
41 HD 101108 * 11 38 19.3665601704 +38 45 16.899688742   9.05 8.87     A5_lB 39 0
42 V* V1023 Cen dS* 11 47 59.7573720236 -40 17 29.471529535   8.18 7.94     A9VkA5mA5(_lB) 29 0
43 HD 105058 dS* 12 05 43.3557996963 +49 40 55.995517673   9.05 8.88     A2p 58 0
44 HD 106223 PM* 12 13 16.8985951261 +30 16 58.950109119 7.64 7.72 7.44     hF3VkA3mA3_lB 87 0
45 HD 109738 * 12 37 38.0629096186 -67 51 53.375811626   8.50 8.30     hA9VkA1mA1_lB 32 0
46 * 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
47 HD 111005 * 12 46 14.8232750824 +02 27 51.466749998   8.30 7.97     A9V 37 0
48 V* DT CVn dS* 12 50 10.7399345981 +37 31 00.980973965   6.025 5.872     A5Vp_lB 91 0
49 V* MO Hya dS* 12 51 57.8969100913 -26 44 17.797063067   6.358 6.141     F0VkA1mA1_lB 114 0
50 V* FQ Boo dS* 13 49 44.1555631872 +08 24 31.089806068   6.717 6.604     hA5VkA2mA2_lB 43 0
51 V* QT Vir dS* 13 52 09.3007652938 +06 00 04.840971849   8.76 8.51     hF0VkA6mA6_lB 24 0
52 * 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
53 HD 125889 * 14 23 15.7477855463 -35 49 55.023833751   10.08 9.81     F1VkA4mA4(_lB?) 19 0
54 HD 130767 * 14 49 28.7082515018 +19 30 37.313424431   6.94 6.90   6.85 A0Va_lB 27 0
55 V* HR Lib dS* 15 56 33.3735361896 -14 49 45.972376397   6.345 6.117     A2Ib/II 106 0
56 NGC 6025 OpC 16 03 17 -60 25.9           ~ 83 0
57 V* NP TrA dS* 16 33 05.1549259176 -60 54 12.846211369   8.09 7.90     A2IVn 22 0
58 HD 149130 * 16 36 38.5934212065 -62 38 52.614912890   8.79 8.48     A8w 30 0
59 HD 153747 dS* 17 02 53.8269754192 -38 27 36.819889435   7.54 7.42     A7VkA0mA0_lB 49 1
60 HD 154153 * 17 05 48.4607447649 -44 06 18.164029462   6.450 6.178     F1VkA3mA3_lB? 51 1
61 HD 156954 * 17 21 00.3553365771 -13 05 07.623145971   7.97 7.67     F0.5VkA9mA9 40 1
62 IC 4665 OpC 17 46 18 +05 43.0           ~ 317 0
63 NGC 6475 OpC 17 53 51 -34 47.6           ~ 340 0
64 V* V704 CrA dS* 18 24 30.0555933927 -44 11 56.685725998   8.35 8.11     F0VkA3mA3_lB 22 0
65 V* V346 Pav dS* 18 25 31.6299481485 -63 01 17.532599707   6.313 6.122     A8VkA2mA2_lB 65 0
66 NGC 6633 OpC 18 27 31.2 +06 34 12           ~ 328 0
67 HD 170680 * 18 31 26.2981687662 -18 24 09.706451275   5.126 5.117     B9/9.5V 78 0
68 HD 171948 SB* 18 36 37.0231010931 +22 06 27.292508161   6.82 6.77     B9 32 1
69 IC 4756 OpC 18 38 31.2 +05 29 24           ~ 199 0
70 HD 175445 * 18 55 33.2830882627 -02 18 23.651443765   7.90 7.79     A2Va 18 1
71 * c Aql dS* 19 29 00.9870438377 +01 57 01.618441082   5.865 5.783     A0IVp 166 0
72 HD 184779 * 19 37 59.4733698597 -43 54 28.031115023   9.17 8.90     F0VkA5mA5(_lB) 25 0
73 HD 191850 V* 20 13 54.5078336199 -46 33 23.194742463   9.87 9.69 9.6 10.953 A9VkA3mA3_lB 24 0
74 * b03 Cyg dS* 20 14 32.0319919055 +36 48 22.684605093 5.10 5.11 4.99 4.79 4.72 A2V 242 0
75 HD 193281 * 20 20 27.8805474206 -29 11 49.975108388   6.76 6.64 7.50   A2IV-V 91 0
76 CD-62 1338A PM* 20 51 38.5079641449 -62 25 45.594366275   6.35 6.21 6.55   A3IV(n) 69 0
77 NGC 7039 OpC 21 10 48 +45 37.0   8.06 7.6     ~ 49 0
78 NGC 7063 OpC 21 24.4 +36 29   7.32 7.0     ~ 68 0
79 HD 204041 PM* 21 25 51.5846178730 +00 32 03.619939380   6.593 6.450     A1Vb 95 0
80 NGC 7092 OpC 21 31 48 +48 26.0           ~ 191 0
81 IC 1396 OpC 21 39 00 +57 29.4           ~ 447 1
82 NGC 7160 OpC 21 53 40 +62 36.2   6.34 6.1     ~ 208 0
83 NGC 7209 OpC 22 05 07 +46 29.0   8.24 7.7     ~ 109 0
84 HD 210111 dS* 22 08 42.6438955365 -33 07 32.498239929   6.564 6.386     A9VkA2mA2_lB 73 0
85 NGC 7243 OpC 22 15 08 +49 53.9   6.54 6.4     ~ 102 0
86 HD 216847 * 22 57 22.0095939150 -56 52 30.697149869   7.29 7.06     A7V 26 0
87 * 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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2020.11.29-00:53:41

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