2001A&A...376..885U


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.19CEST21:02:13

2001A&A...376..885U - Astronomy and Astrophysics, volume 376, 885-891 (2001/9-4)

Spectroscopic investigations of classical Cepheids and main-sequence stars in galactic open clusters and associations. II. Open cluster Platais 1 (C2128+488) and small-amplitude Cepheid V1726 Cygni.

USENKO I.A., KOVTYUKH V.V., KLOCHKOVA V.G. and PANCHUK V.E.

Abstract (from CDS):

The small-amplitude Cepheid V1726 Cyg and two members of open cluster Platais 1 (Platais 1 star No. 1 (1921) and Platais 1 star No. 111 (1600)) were investigated, using high-resolution CCD spectra. The following results were obtained: 1) All objects have the same metallicities, close to that of the Sun (for V1726 Cyg weighted average [Fe/H]=+0.05, for Platais 1 star No. 1 (1921) [Fe/H]=+0.13); 2) values of Teff and logg for the B-stars are in excellent agreement with those determined from (B-V) colour indices using a (B-V)~(Teff, logg) calibration; 3) the elemental abundances indicate that V1726 Cyg is in the post first dredge-up stage with an age near 1.5x108, and is crossing the Cepheid instability strip for the third time. Mean values of Teff=6100K and logg=2.35±0.05 permit us to refine its colour excess to EB–V=0.33mag, which for a distance of d=1568±13pc corresponds to MV=-2.99mag. The Cepheid could therefore be pulsating in the fundamental tone, although pulsation in the first overtone is not excluded; 4) Platais 1 Star No. 1 (1921) is a slowly rotating HgMn-star with a high helium content, while Platais 1 star No. 111 (1600) is a rapidly rotating main-sequence star with a helium content comparable to that of the Sun; 5) the age of the open cluster is estimated to be about 2.5x108yr.

Abstract Copyright:

Journal keyword(s): galaxy: open clusters: and associations - stars: abundances - stars: Cepheids - stars: general

Simbad objects: 11

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Number of rows : 11

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 17327 ** 02 49 58.13254 +64 37 50.8803 7.7 7.794 7.503     B8II-III 25 0
2 HD 17443 * 02 51 32.7701457866 +67 48 54.158169711   9.04 8.75     B9V 37 2
3 V* SU Cas cC* 02 51 58.7508894403 +68 53 18.601570075 6.92 6.44 5.80     F5.5III+ 412 1
4 NGC 1647 OpC 04 45 55 +19 06.9   6.82 6.4     ~ 146 0
5 Cl* NGC 7092 PLAT 1 * 21 26 07.2587369540 +48 27 06.092796166   14.19 13.88     ~ 2 0
6 Cl* NGC 7092 PLAT 111 * 21 26 51.9186259390 +48 15 35.647744129   15.05 14.46     ~ 2 0
7 Cl* NGC 7092 PLAT 1600 * 21 29 24.4975814196 +48 59 20.616563692   13.00 12.63     ~ 3 0
8 V* V1726 Cyg cC* 21 29 38.9420420958 +48 58 08.704046445   9.76 8.91     F5 67 1
9 Cl* NGC 7092 PLAT 1921 * 21 29 45.4791488232 +48 58 28.145077984   11.39 11.16     B8V: 6 0
10 Cl Platais 1 OpC 21 30 02 +48 58.6           ~ 24 2
11 Ass Cas OB 2 As* 23 20 +60.9           ~ 65 0

    Equat.    Gal    SGal    Ecl

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2021.04.19-21:02:13

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