2000A&A...355..308A


Query : 2000A&A...355..308A

2000A&A...355..308A - Astronomy and Astrophysics, volume 355, 308-314 (2000/3-1)

On the effective temperatures, surface gravities and optical region fluxes of the CP stars.

ADELMAN S.J. and RAYLE K.E.

Abstract (from CDS):

We determined effective temperatures and surface gravities for 17 magnetic Chemically Peculiar (mCP) stars by comparing optical region spectrophotometry and Hγ profiles with the predictions of ATLAS9 model atmospheres. Although solar composition models can fit the energy distributions of the normal and many Mercury-Manganese stars, they cannot match the optical energy distributions of the mCP stars, especially the λ5200 broad, continuum regions. The role of metallicity and microturbulence to provide appropriate energy distributions which fit those observed for the mCP stars is investigated. Using metal-rich models with the opacity distribution functions for microturbulent velocities of 4 and 8 km.s–1, their λ5200 broad, continuum features are often fit as part of this process. For some stars it is impossible to fit simultaneously both this feature and the line blanketing in the Hγ region. This suggests that this continuum feature is produced by elements other than those which contribute most of the general line blanketing. A systematic difference in the temperatures found by the photometric and spectrophotometric approaches is discovered for the hotter mCP stars. An investigation of 10 Mercury-Manganese stars shows a similar effect. This may be due to the photospheric compositions becoming less solar with increasing temperature.

Abstract Copyright:

Journal keyword(s): stars: chemically peculiar - stars: fundamental parameters

Simbad objects: 27

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Number of rows : 27
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 * 56 Ari a2* 03 12 14.2461137352 +27 15 25.085668788 5.22 5.64 5.76     B6IV-V 255 0
2 * 53 Tau a2* 04 19 26.0975894496 +21 08 32.298968148   5.413 5.482     B9Vsp 260 0
3 * mu. Lep a2* 05 12 55.9029641016 -16 12 19.668599100 2.78 3.18 3.29 3.30 3.42 B9IV:HgMn 270 1
4 * bet Tau PM* 05 26 17.51312 +28 36 26.8262 1.03 1.52 1.65 1.66 1.76 B7III 357 1
5 * nu. Cnc SB* 09 02 44.2677118128 +24 27 10.392222600   5.404 5.447     A0III 193 0
6 * kap Cnc a2* 09 07 44.8095541176 +10 40 05.519586828 4.70 5.13 5.24     B8IIImnp 356 0
7 * gam Crv PM* 12 15 48.37081 -17 32 30.9496 2.12 2.47 2.58 2.62 2.71 B8III 232 0
8 * 17 Com a2* 12 28 54.7022406648 +25 54 46.265813136   5.208 5.236     A0p 267 0
9 * 21 Com a2* 12 31 00.5605002264 +24 34 01.797245328   5.496 5.436     A2pv 258 0
10 * eps UMa a2* 12 54 01.7495922 +55 57 35.362645 1.76 1.75 1.77 1.79 1.82 A1III-IVpkB9 463 0
11 * o Vir a2* 13 34 07.9318557 +03 39 32.273821 4.96 4.96 4.94 4.86 4.89 ApEuCrSr 331 0
12 * 84 UMa a2* 13 46 35.6567876472 +54 25 57.643558644   5.632 5.675     A0VpSrCrEu 153 0
13 V* CU Vir a2* 14 12 15.8054758 +02 24 33.953395 4.46 4.90 5.02 5.10 5.23 ApSi 371 0
14 HD 133029 a2* 15 00 38.7178984848 +47 16 38.791986348   6.250 6.351     A0VspSiSrCr 209 0
15 * bet CrB a2* 15 27 49.7315305 +29 06 20.522375 4.08 3.97 3.68 3.50 3.45 F2VpSrCrEuSi 671 0
16 * chi Ser a2* 15 41 47.4147355608 +12 50 51.093705840 5.42 5.37 5.33 5.28 5.32 A2VpMnEu(Sr) 180 0
17 * ups Her PM* 16 02 47.8978183032 +46 02 12.133917132 4.33 4.616 4.709     B9III 232 0
18 * phi Her a2* 16 08 46.1762180496 +44 56 05.661355344 3.92 4.20 4.27 4.27 4.36 B9VspHgMn 288 1
19 HD 147550 * 16 22 38.9052134400 -02 04 47.519268672   6.288 6.241     B9V 106 0
20 V* V773 Her a2* 16 36 42.9385265832 +15 29 50.827223688   6.296 6.355     A2VpSiSrCr 102 0
21 V* V451 Her a2* 17 01 33.0515292528 +14 56 58.988031648 6.39 6.35 6.31     A0VpSiSrCrEu 172 0
22 HD 170973 a2* 18 32 06.8865165216 +03 39 34.601753412   6.381 6.407     B9IIIpSi 122 0
23 * 10 Aql a2* 18 58 46.9240671288 +13 54 23.941711692 6.23 6.14 5.89     A7VpSrEu_Ksn 278 0
24 * 14 Sge SB* 20 03 30.0147595968 +16 01 52.508306604 5.39 5.550 5.658     B9pHgMn 131 0
25 * 73 Dra a2* 20 31 30.4066960752 +74 57 16.653861468   5.271 5.185     A9:VpCrSrEu 255 1
26 * gam Equ a2* 21 10 20.5000721160 +10 07 53.691967776 5.03 4.94 4.68 4.43 4.32 A9VpSrCrEu 531 0
27 HD 204411 a2* 21 26 51.6219389280 +48 50 06.599806584 5.54 5.38 5.31     A4VpSiCrHg 180 0

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2022.05.22-06:30:00

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