2007AJ....134..926K


Query : 2007AJ....134..926K

2007AJ....134..926K - Astron. J., 134, 926-933 (2007/September-0)

Chemical composition and differential time-series CCD photometry of V2314 Ophiuchi: a new λ Bootis-type star.

KIM C., YUSHCHENKO A.V., GOPKA V.F., DOROKHOVA T.N., MUSAEV F.A., KIM S.-L., JEON Y.-B., IBRAHIMOV M. and TARASOV A.E.

Abstract (from CDS):

We investigated V2314 Oph using high-resolution (R=45,000) spectral observations. The atmospheric parameters were determined using iron-line abundance analysis. We derived a mean effective temperature of Teff=7510 K, mean surface gravity of logg=3.30, metallicity of [Fe/H]=-0.59, and rotation velocity of vsini=38 km/s. The abundances of 19 chemical elements were determined. The abundance pattern of V2314 Oph was found to be similar to that of λ Bootis-type stars. V2314 Oph is also a variable star, as are a majority of λ Bootis stars. A frequency analysis of 10 selected nights of precise differential photometry has preliminarily revealed four pulsational modes. The multiperiodic solution of the light curve is probably more similar to a low-amplitude Population I δ Scuti variable pattern, as is apparent for many λ Bootis stars. For asteroseismic investigations of the star it is necessary to obtain more prolonged, continuous time-series observations. These features, as well as the small proper motion and relatively large rotational velocity of V2314 Oph, specify the star as not likely to be a field SX Phoenicis Population II variable, as was suggested previously.

Abstract Copyright: ∼

Journal keyword(s): Stars: Abundances - stars: individual (V2314 Ophiuchi) - stars: individual (SX Phoenicis) - stars: individual (δ Scuti) - Stars: Individual: Constellation Name: λ Bootis - Stars: Oscillations

VizieR on-line data: <Available at CDS (J/AJ/134/926): table2.dat table4.dat>

Simbad objects: 17

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Number of rows : 17
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026
#notes
1 HD 15165 dS* 02 26 45.6478667280 +10 33 55.070566704   6.94 6.69     F0IV 97 0
2 GD 428 SX* 03 47 19.8773016336 +63 22 42.150015336   13.10   13.26   ~ 104 0
3 * 66 Eri a2* 05 06 45.6527881872 -04 39 18.601025148 4.89 5.06 5.12     B9V 157 1
4 UCAC2 30135337 * 05 06 46.2895252656 -04 38 26.450432448 13.34 11.94 10.80 10.58 9.65 ~ 15 1
5 V* KZ Hya SX* 10 50 54.0711823776 -25 21 14.729108688   10.19 10.06     B9III/IV 86 0
6 * lam Boo dS* 14 16 23.0184083839 +46 05 17.895459693 4.31 4.26 4.18 4.16 4.13 A0Va_lB 362 0
7 HD 153720 SB* 16 52 55.2378483000 +75 23 34.112230044 7.210 7.150 6.840     A7m 39 0
8 HD 161184 ** 17 43 51.657 +05 50 42.10   9.19 9.20 8.76   A0 43 0
9 V* V2314 Oph dS* 17 44 03.6257455416 +06 03 42.497438940   7.76 7.43     A2 34 0
10 HD 161542 * 17 45 55.1705033976 +05 54 28.084908132   7.63 7.51     A0 26 0
11 IC 4665 OpC 17 46 04.0 +05 36 54           ~ 407 0
12 V* LZ Her SX* 17 49 29.2046363928 +29 19 15.740563476     13.48     ~ 23 1
13 * del Sct dS* 18 42 16.4268984096 -09 03 09.188922060   5.04 4.71     F2II-III 507 0
14 * zet Cyg SB* 21 12 56.1859894833 +30 13 36.835250232 4.96 4.20 3.21 2.52 2.04 G8+III-IIIaBa0.5 353 0
15 V* CY Aqr SX* 22 37 47.8520659536 +01 32 03.805667412 10.75 10.61 10.44     B8 218 0
16 HD 221170 Pe* 23 29 28.8087143040 +30 25 57.849303180 9.43 8.74 7.66     CEMP-r 306 0
17 V* SX Phe SX* 23 46 32.8928138474 -41 34 54.769886474   7.54 7.31     A3V 348 0

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