J/AJ/138/312 Activity of bright solar analogs (Hall+, 2009)
The activity and variability of the Sun and Sun-like stars.
II. Contemporaneous photometry and spectroscopy of bright solar analogs.
Hall J.C., Henry G.W., Lockwood G.W., Skiff B.A., Saar S.H.
<Astron. J., 138, 312-322 (2009)>
=2009AJ....138..312H 2009AJ....138..312H
ADC_Keywords: Sun ; Stars, G-type ; Photometry
Keywords: stars: activity - Sun: activity
Abstract:
We present 14 years of contemporaneous photometric and spectroscopic
observations of 28 solar analog stars, taken with the Tennessee State
University Automatic Photometric Telescopes at Fairborn Observatory
and the Solar-Stellar Spectrograph at Lowell Observatory. These are
the best observed and most nearly Sun-like of the targets in our
magnitude-limited (V≤7.5) sample. The correlations between
luminosity and activity reveal the expected inverse
activity-brightness correlations for active stars. Strong direct
correlations between activity and brightness are not prevalent for the
less active solar age stars, but are precision limited.
Description:
The HK series presented in this paper result from a reprocessing of
our ∼30000 solar and stellar spectra following a seven month
observing hiatus from 2008 January-July.
We acquired the photometric observations in this paper with the T4
0.75-m and the T8 0.8-m APTs at Fairborn Observatory.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 39 28 Target Stars and their Properties
table3.dat 65 284 Seasonal means
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See also:
J/A+A/468/663 : Li abundances in solar-analog stars (Takeda+, 2007)
J/A+A/508/L17 : Abundances in solar analogs (Ramirez+, 2009)
J/ApJS/181/62 : Survey of young solar analogs (Metchev+, 2009)
J/A+A/515/A93 : Li abundances in solar-analog stars. II. (Takeda+, 2010)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HD Star HD number
8- 9 I2 --- Nseas Number of seasons
11- 14 F4.2 mag Vmag V magnitude (1)
15 A1 --- r_Vmag [bcd] Reference for Vmag (2)
17- 21 F5.3 mag b-y b-y colour index (1)
22 A1 --- r_b-y [e] Reference for b-y (2)
24- 30 A7 --- SpType MK spectral type
32- 36 F5.2 [-] [M/H] Metallicity (1)
38- 39 A2 --- Prog [ELM ] Programs (3)
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Note (1): Except where noted,
* V magnitudes are from Johnson et al. (1966CoLPL...4...99J 1966CoLPL...4...99J), and
* b-y colors are from Olsen (1993, Cat. J/A+AS/102/89, 1994,
Cat. J/A+AS/104/429).
* Metal abundances are taken from Valenti & Fischer (2005,
Cat. J/ApJS/159/141) and Gray et al. (2003, Cat. J/AJ/126/2048).
Note (2): Notes as follows:
b = Carney (1978AJ.....83.1087C 1978AJ.....83.1087C)
c = Mermilliod (1986EgUBV........0M 1986EgUBV........0M)
d = Bidelman (1951ApJ...113..304B 1951ApJ...113..304B)
e = Crawford et al. (1966AJ.....71..709C 1966AJ.....71..709C)
Note (3): Programs as follows:
E = ELODIE (Soubiran & Triaud, 2004A&A...418.1089S 2004A&A...418.1089S)
M = Mt. Wilson (Baliunas et al., 1995ApJ...438..269B 1995ApJ...438..269B)
L = Lockwood et al. (2007ApJS..171..260L 2007ApJS..171..260L)
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HD Star HD number
8- 13 F6.1 yr Season [1994/2008.4] Midpoint of photometric/HK
observing season
15- 19 F5.3 --- Seasonal mean Mount Wilson S index
21- 26 F6.3 [-] <logR'HK> Seasonal mean R'HK activity index
28- 37 E10.3 mW/m2 DFHK Seasonal mean excess flux in erg/s/cm2
39- 48 E10.3 mW/m2 e_DFHK The 1σ error in DFHK
50- 57 F8.5 mag (b+y)/2 Photometric brightness (1)
59- 65 F7.5 mag e_(b+y)/2 The 1σ error in (b+y)/2
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Note (1): Relative to grand mean of all observations.
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History:
From electronic version of the journal
References:
Hall et al., Paper I 2007AJ....133..862H 2007AJ....133..862H
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 16-Nov-2011