J/MNRAS/429/1466 Kepler stars in the NGC 6866 field (Balona+, 2013)
Pulsation and rotation of Kepler stars in the NGC 6866 field.
Balona L.A., Joshi S., Joshi Y.C., Sagar R.
<Mon. Not. R. Astron. Soc., 429, 1466-1478 (2013)>
=2013MNRAS.429.1466B 2013MNRAS.429.1466B
ADC_Keywords: Clusters, open ; Stars, variable
Keywords: stars: oscillations -
stars: rotation, starspots, stars: variables: δ Scuti -
stars: variables: general -
open clusters and associations: individual: NGC 6866
Abstract:
We present an analysis of stars in the field of the open cluster
NGC 6866 (age 650Myr) using data from the Kepler Input Catalogue
(KIC) and time series photometry from the Kepler data base. We
identify 31 δ Scuti and 8 γ Doradus pulsating variables as
well as 23 red giants with solar-like oscillations. There are 4
eclipsing binaries and 106 stars showing rotational modulation
indicative of starspots. We attempted to identify cluster members
using their proper motions but found very poor discrimination between
members and non-members. The KIC shows a concentration of stars with
distance modulus V0-MV=10.47±0.02. We used assumed radial modes
in 9 δ Sct stars to determine their asteroseismic luminosities
and found that the distance modulus falls within three narrow ranges
depending on the assignment of overtone number. One of these ranges
coincides with the KIC distance modulus. The rotation periods of
main-sequence stars are correlated with colour, so that a
period-age-mass relation can be derived from open clusters and applied
to stars of unknown ages. Surprisingly, we find that the correlation
applies not only to cool stars, but extends to A-type stars in the
cluster. Finally, we present measurements of solar-like oscillations
in red giants, a few of which might be cluster members.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 65 31 δScuti stars in the field of NGC 6866
table4.dat 65 8 γDor stars in the field of NGC 6866
table5.dat 67 6 Eclipsing binaries and peculiar variables in
the field of NGC 6866
table6.dat 76 106 Stars with rotational modulation (starspots)
table7.dat 84 23 Stars with solar-line oscillations in the
field of NGC 6866
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See also:
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
J/AcA/59/193 : BV photometry of stars in NGC 6866 (Molenda-Zakowicz+, 2009)
J/PAZh/36/354 : NGC 6866 proper motions and CCD photometry (Frolov+, 2010)
Byte-by-byte Description of file: table1.dat table4.dat table5.dat
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Bytes Format Units Label Explanations
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1- 7 I7 --- KIC KIC number (Cat. V/133)
9 A1 --- Mm [M] Membership (M=Member) (G1)
11- 13 I3 --- JJ ? Joshi et al. (2012MNRAS.419.2379J 2012MNRAS.419.2379J) number
15- 17 A3 --- MK Molenda et al. (2009, Cat. J/AcA/59/193) name
<[MKS2009] VNN> in Simbad
19- 22 F4.2 arcmin Dist Distance from cluster center
24- 25 I2 h RAh Right ascension (J2000)
27- 28 I2 min RAm Right ascension (J2000)
30- 31 I2 s RAs Right ascension (J2000)
33 A1 --- DE- Declination sign (J2000)
34- 35 I2 deg DEd Declination (J2000)
37- 38 I2 arcmin DEm Declination (J2000)
40- 41 I2 arcsec DEs Declination (J2000)
43 A1 --- Cad [LS] Kepler cadence (L=long, S=short)
45- 50 F6.3 mag kepmag Kepler magnitude from KIC
52- 57 F6.4 [K] logTe ? Corrected effective temperature as derived
from KIC
59- 65 F7.4 [Lsun] logL ? Luminosity as derived from KIC
67 A1 --- Type [EP] Eclipsing or Peculiar variable for table5
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 I7 --- KIC KIC number
9 A1 --- Mm [M] Membership (M=Member) (G1)
11- 13 I3 --- JJ ? Joshi et al. (2012MNRAS.419.2379J 2012MNRAS.419.2379J) number
19- 22 F4.2 arcmin Dist Distance from cluster center
24- 25 I2 h RAh Right ascension (J2000)
27- 28 I2 min RAm Right ascension (J2000)
30- 31 I2 s RAs [0/60] Right ascension (J2000)
33 A1 --- DE- Declination sign (J2000)
34- 35 I2 deg DEd Declination (J2000)
37- 38 I2 arcmin DEm Declination (J2000)
40- 41 I2 arcsec DEs [0/60] Declination (J2000)
43 A1 --- Cad [LS] Kepler cadence (L=long, S=short)
45- 50 F6.3 mag kepmag Kepler magnitude
52- 57 F6.4 [K] logTe ? Corrected effective temperature
59- 65 F7.4 [Lsun] logL ? Luminosity as derived from KIC
67- 70 F4.2 d-1 f1 Frequency of highest amplitude
72- 76 F5.2 mmag Amp Amplitude
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 I7 --- KIC KIC number
9 A1 --- Mm [M] Membership (M=Member) (G1)
11- 13 I3 --- JJ ? Joshi et al. (2012MNRAS.419.2379J 2012MNRAS.419.2379J) number
19- 22 F4.2 arcmin Dist Distance from cluster center
24- 25 I2 h RAh Right ascension (J2000)
27- 28 I2 min RAm Right ascension (J2000)
30- 31 I2 s RAs Right ascension (J2000)
33 A1 --- DE- Declination sign (J2000)
34- 35 I2 deg DEd Declination (J2000)
37- 38 I2 arcmin DEm Declination (J2000)
40- 41 I2 arcsec DEs Declination (J2000)
43 A1 --- Cad [LS] Kepler cadence (L=long, S=short)
45- 50 F6.3 mag kepmag Kepler magnitude
52- 57 F6.4 [K] logT ? Corrected effective temperature
59- 65 F7.4 [Lsun] logL ? Luminosity as derived from KIC
67- 72 F6.4 [Lsun] logLs ? Luminosity calculated from the solar-like
oscillations
74- 78 F5.1 uHz f1 Frequency of maximum amplitude
80- 84 F5.2 uHz df ? Large separation between f1 and f2
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Global notes:
Note (G1): The star is assumed to be a member if its distance modulus
is in the range 10.0<µ0<11.0mag.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 14-Mar-2014