2001A&A...367..876K


Query : 2001A&A...367..876K

2001A&A...367..876K - Astronomy and Astrophysics, volume 367, 876-883 (2001/3-1)

The angular diameter and distance of the cepheid ζ Geminorum.

KERVELLA P., COUDE DU FORESTO V., PERRIN G., SCHOELLER M., TRAUB W.A. and LACASSE M.G.

Abstract (from CDS):

Cepheids are the primary distance indicators for extragalactic astronomy and therefore are of very high astrophysical interest. Unfortunately, they are rare stars, situated very far from Earth. Though they are supergiants, their typical angular diameter is only a few milliarcseconds, making them very challenging targets even for long-baseline interferometers. We report observations that were obtained in the K' band (2-2.3µm), on the Cepheid ζ Geminorum with the FLUOR beam combiner, installed at the IOTA interferometer. The mean uniform disk angular diameter was measured to be 1.64+0.14–0.16mas. Pulsational variations are not detected at a significant statistical level, but future observations with longer baselines should allow a much better estimation of their amplitude. The distance to ζ Gem is evaluated using Baade-Wesselink diameter determinations, giving a distance of 502±88pc.

Abstract Copyright:

Journal keyword(s): stars: distances - stars: individual: ζ Gem - stars: oscillations - stars: Cepheids - interferometric techniques:

Simbad objects: 8

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Number of rows : 8
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 * 87 Gem * 06 51 59.9861723112 +23 36 06.199162452   7.142 5.671     K5III 44 0
2 * zet Gem cC* 07 04 06.5312384690 +20 34 13.074474962 5.20 4.58 3.79   3.082 G1Ib 552 0
3 * g Gem SB* 07 46 07.4484186384 +18 30 35.993172960 8.09 6.33 4.87 3.72 2.89 K4III 170 0
4 V* U Sgr cC* 18 31 53.3323107600 -19 07 30.261459540 8.50 7.81 6.68   5.413 G1Ib 450 0
5 V* SZ Aql cC* 19 04 39.4158230832 +01 18 22.158826524   9.92 7.92   7.039 F8/G0Ib 184 0
6 * eta Aql cC* 19 52 28.3689223781 +01 00 20.371980515 5.12 4.61 3.80   3.030 F6Iab+B9.8V 654 0
7 V* X Cyg cC* 20 43 24.1917118680 +35 35 16.077149700 8.69 7.70 6.47   5.241 F7Ib 455 0
8 * del Cep cC* 22 29 10.2626640314 +58 24 54.697613650 4.71 4.35 3.75   3.219 F5Iab:+B7-8 706 0

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2022.08.11-02:21:31

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