2002A&A...396..641A


Query : 2002A&A...396..641A

2002A&A...396..641A - Astronomy and Astrophysics, volume 396, 641-648 (2002/12-3)

The elemental abundance pattern of twenty λ Bootis candidate stars.

ANDRIEVSKY S.M., CHERNYSHOVA I.V., PAUNZEN E., WEISS W.W., KOROTIN S.A., BELETSKY Y.V., HANDLER G., HEITER U., KOROTINA L., STUETZ C. and WEBER M.

Abstract (from CDS):

Detailed elemental abundances were derived for twenty bona fide λ Bootis as well as two MK standard stars. Other than LTE abundances for ten elements (including C and O), NLTE values for Na were determined. The group of λ Bootis stars consists of non-magnetic, Population I, late B to early F-type dwarfs with a typical abundance pattern (Fe-peak elements being underabundant whereas C, N, O and S being almost solar abundant). Since classification resolution spectroscopy in the optical domain is not capable of determining the abundance of the light elements, a detailed abundance analysis is the ultimate test for the membership of an object to this group. Another important point is the detection of apparent spectroscopic binary systems in which two solar abundance objects mimic one metal-weak star, as proposed as a working hypothesis by Faraggiana & Bonifacio (1999A&A...349..521F). From twenty program stars we are able to confirm or establish the membership for nine objects (HD 23258, HD 36726, HD 40588, HD 74911, HD 84123, HD 91130, HD 106223, HD 111604 and HD 290799). Five stars (HD 90821, HD 98772, HD 103483, HD 108765 and HD 261904) can be definitely ruled out as being members of the λ Bootis group whereas no unambiguous decision can be drawn for another six stars (HD 66684, HD 105058, HD 120500, HD 141851, HD 201184 and HD 294253). One very important result is the apparent overabundances found for Na which cannot be explained by accretion or mass-loss alone.

Abstract Copyright:

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

Simbad objects: 26

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Number of rows : 26
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 HD 23258 * 03 44 28.2037966608 +20 55 43.448620908   6.100 6.074     A0Vp_lB 54 0
2 * pi.01 Ori PM* 04 54 53.7287660 +10 09 02.995200   4.723 4.648     A0Va_lB 249 0
3 HD 36726 * 05 33 51.7278163992 -00 04 36.342051096   8.91 8.82     hA5VkA0mA0_lB 38 1
4 HD 294253 * 05 36 41.7835166016 -03 30 12.476798712   9.68 9.67     A0 28 0
5 V* V1790 Ori dS* 05 40 24.2915301336 -00 46 16.753504332   10.8 10.8     A0 28 0
6 HD 40588 * 06 01 10.0410808248 +31 02 04.262019612 6.360 6.280 6.190     A3VkA0.5mA0_lB 39 0
7 HD 261904 Y*O 06 41 00.6874797312 +09 24 11.888973612   10.38 9.50     A0/1 38 0
8 HD 66684 ** 08 05 37.05577 +27 31 47.0419   6.22 6.21     B9.5Vp_lB+A0Vnp 43 0
9 HD 74911 * 08 47 10.1616904416 +09 23 00.712309380   8.64 8.51     A5 16 0
10 HD 84123 PM* 09 44 06.8766339648 +42 03 03.128528304   7.135 6.838     A4III 53 0
11 HD 90821 * 10 29 37.0986897144 +26 10 58.569963240   9.54 9.45     F0 19 0
12 * 33 LMi * 10 31 51.3753968952 +32 22 46.405276428   6.001 5.905     A0Va- 67 0
13 HD 98772 * 11 22 51.2436595560 +64 19 49.841322096 6.180 6.110 6.030     A3V 55 0
14 * 65 UMa A EB* 11 55 05.7460955088 +46 28 36.597092700   6.76 6.67     hA5VkA2mA3 89 0
15 HD 105058 dS* 12 05 43.3556676096 +49 40 55.994662056   9.05 8.88     A2p 60 0
16 HD 106223 PM* 12 13 16.8983653416 +30 16 58.946364228 7.64 7.72 7.44     hF3VkA3mA3_lB 88 0
17 * 20 Com * 12 29 43.2400536144 +20 53 45.989241288   5.751 5.679     A3V 76 0
18 * gam Vir PM* 12 41 39.6282288151 -01 26 57.854228847 3.07 3.10 2.74 2.45 2.26 F1-F2V 456 0
19 V* DT CVn dS* 12 50 10.7400521424 +37 31 00.979591260   6.025 5.872     A5Vp_lB 93 0
20 V* FQ Boo dS* 13 49 44.1554383104 +08 24 31.089742272   6.717 6.604     hA5VkA2mA2_lB 45 0
21 * bet Cir PM* 15 17 30.8501567 -58 48 04.337319   4.153 4.057     A3Va 116 0
22 * b Ser ** 15 51 15.5941805 -03 05 25.793806   5.23 5.10     A2IV-Vn 108 0
23 * b03 Cyg dS* 20 14 32.0323540824 +36 48 22.700909124 5.10 5.11 4.99 4.79 4.72 A2V 246 0
24 * chi Cap PM* 21 08 33.6250217616 -21 11 37.214550420   5.320 5.316     A0Van 62 0
25 HD 204041 PM* 21 25 51.5848015320 +00 32 03.634403820   6.593 6.450     A1Vb 100 0
26 * 15 And dS* 23 34 37.5368337288 +40 14 11.182658856   5.652 5.563 6.91   A1Va 129 0

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2022.05.28-09:45:25

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