2003A&A...402..247P


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST01:07:31

2003A&A...402..247P - Astronomy and Astrophysics, volume 402, 247-252 (2003/4-4)

On the evolutionary status of chemically peculiar stars of the upper main sequence.

POEHNL H., MAITZEN H.M. and PAUNZEN E.

Abstract (from CDS):

We present further evidence that the magnetic chemically peculiar stars (CP2) of the upper main sequence already occur at very early stages of the stellar evolution, significantly before they reach 30% of their life-time on the main sequence. This result is especially important for models dealing with dynamo theories, angular momentum loss during the pre- as well as main sequence and evolutionary calculations for CP2 stars.
Result. from the literature either derived for objects in the Hyades and the UMa cluster or from the Hipparcos mission contradict each other. A way out of this dilemma is to investigate young open clusters with known ages and accurate distances (error<10%), including CP2 members. Up to now, four open clusters fulfill these requirements: IC 2391, IC 2602, NGC 2451A and NGC 2516. In total, 13 CP2 stars can be found within these clusters. We have used the measurements and calibrations of the Geneva 7-color photometric system to derive effective temperatures and luminosities. Taking into account the overall metallicity of the individual clusters, isochrones and evolutionary tracks were used to estimate ages and masses for the individual objects. The derived ages (between 10 and 140Myr) are well in line with those of the corresponding clusters and further strengthen the membership of the investigated CP2 stars.

Abstract Copyright:

Journal keyword(s): stars: chemically peculiar - stars: early-type - open clusters and associations: general

Simbad objects: 21

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Number of rows : 21

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 NGC 2451A OpC 07 43 12 -38 24.0           ~ 81 0
2 NGC 2451B OpC 07 44 27 -37 40.0           ~ 61 0
3 HD 62992 a2* 07 45 01.6127329015 -38 09 30.279036600   8.00 7.87     A5/7(IV) 28 0
4 V* OX Pup a2* 07 47 05.7575582019 -39 19 51.585438001   6.171 6.322     ApSi 73 0
5 V* V607 Car a2* 07 56 22.6799840843 -61 17 02.133843497   9.365 9.340     ApSi 31 0
6 CPD-60 944A a2* 07 56 45.1050085393 -60 48 54.286466505   8.345 8.370     B8pSi 33 0
7 CPD-60 944B * 07 56 46.2610296024 -60 48 58.297316046   8.77 8.756     B8III 30 0
8 CD-60 1932 * 07 56 59.5712465418 -60 47 01.829657678   9.94 9.93   9.500 A0V 25 0
9 V* V391 Car a2* 07 58 02.5003017992 -60 48 46.809502918   8.89 8.96     A0pEuCrSr 55 0
10 V* V356 Car Al* 07 58 02.9122272935 -60 36 53.227575079 7.22 7.55 7.59     B9.5IVpSi 79 0
11 NGC 2516 OpC 07 58 04 -60 45.2           ~ 587 0
12 V* V392 Car Al* 07 58 10.4768160715 -60 51 57.409026358   9.69 9.48     A2Vp:Sr:Cr:Eu: 64 0
13 CD-60 1993 * 07 58 53.0407158838 -60 36 10.580030649   9.95 9.78   9.542 A1/2V 24 0
14 CD-60 1999 * 07 59 15.3758405552 -60 52 05.203726116   10.09 9.96   9.796 A1V 27 0
15 V* V422 Car a2* 07 59 21.2950129087 -60 48 56.379239270   9.13 9.08     B8/9pSi 65 0
16 HD 66318 * 07 59 27.4746869367 -60 47 47.109578700   9.69 9.56   9.555 A0pEuCrSr 84 0
17 IC 2391 OpC 08 40 32 -53 02.0           ~ 714 0
18 V* KT Vel a2* 08 42 18.9920732 -53 06 00.201557 4.79 5.340 5.474     B9III(pSi) 94 0
19 V* V407 Car a2* 10 38 17.5536103438 -65 02 30.964793188   6.646 6.711     B9Vn 76 0
20 V* V364 Car a2* 10 40 11.4478094717 -65 06 00.740462343 4.79 5.36 5.52     ApSi 132 0
21 IC 2602 OpC 10 42 58 -64 24.0           ~ 549 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-01:07:31

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