J/ApJS/186/191 VI photometry and spectroscopy in h+χ Per (Currie+, 2010)
The stellar population of h and χ Persei: cluster properties, membership,
and the intrinsic colors and temperatures of stars.
Currie T., Hernandez J., Irwin J., Kenyon S.J., Tokarz S., Balog Z.,
Bragg A., Berlind P., Calkins M.
<Astrophys. J. Suppl. Ser., 186, 191-221 (2010)>
=2010ApJS..186..191C 2010ApJS..186..191C
ADC_Keywords: Associations, stellar ; Photometry, VRI ; Spectra, infrared
Spectral types ; Clusters, open
Keywords: open clusters and associations: individual (NGC 869, NGC 884)
stars: pre-main sequence
Abstract:
From photometric observations of ∼47000 stars and spectroscopy of
∼11000 stars, we describe the first extensive study of the stellar
population of the famous Double Cluster, h and χ Persei, down to
subsolar masses. By analyzing optical spectra and optical/infrared
photometry, we constrain the distance moduli (dM), reddening
(E(B-V)), and ages for h Persei, χ Persei, and the low-density
halo population surrounding both cluster cores. With the exception of
mass and spatial distribution, the clusters are nearly identical in
every measurable way. From these data, we establish the first
spectroscopic and photometric membership lists of cluster stars down
to early/mid M dwarfs. At minimum, there are ∼5000 members within 10'
of the cluster centers, while the entire h and χ Persei region has
at least ∼13000 and as many as 20000 members. The Double Cluster
contains ∼8400M☉ of stars within 10' of the cluster centers. We
estimate a total mass of at least 20000M☉. We conclude our study
by outlining outstanding questions regarding the past and present
properties of h and χ Persei. From comparing recent work, we compile
a list of intrinsic colors and derive a new effective temperature
scale for O-M dwarfs, giants, and supergiants.
Description:
Optical VI photometry of h and χ Persei were taken with the Mosaic
Imager at the 4m Mayall telescope at the Kitt Peak National
Observatory on 2006 October 13-16 and 27-30.
We acquired low-resolution optical spectroscopy of Two Micron All Sky
Survey (2MASS)-detected stars within 1deg2 of the cluster centers.
For faint stars, we used the multiobject, fiber-fed spectrograph
Hectospec on the 6.5m MMT. Brighter stars were observed with the
fiber-fed spectrograph Hydra on the 3.5m WIYN telescope at Kitt Peak
National Observatory and single-slit FAST spectrograph on the 1.5m
Tillinghast telescope at the Fred Lawrence Whipple Observatory.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 64 47060 Optical photometry catalog
table2.dat 82 11309 Spectroscopy catalog
table3.dat 116 7465 Combined catalog for stars with optical photometry
and spectroscopy (spectral types and extinction)
table6.dat 76 14160 Combined list of h and χ Persei members
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See also:
J/AJ/122/248 : h and chi Per UBVI,Hα photometry (Keller+, 2001)
J/PASP/114/233 : h and χ Per memberships (Uribe+, 2002)
J/ApJ/576/880 : CCD UBV photometry of h and χ Per (Slesnick+, 2002)
J/ApJ/659/599 : IRAC and JHKs photometry of h and chi Persei (Currie+, 2007)
http://tdc-www.cfa.harvard.edu/instruments/hectospec/progs/HXP/ : Hectospec
data web site
http://tdc-www.cfa.harvard.edu/instruments/hectospec/progs/hxp/hydra.html :
Hydra data web site
http://tdc-www.cfa.harvard.edu/instruments/fast/progs/ : FAST, programs 83
and 170, data web site
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- Seq [1/47060] Running index number
7- 13 F7.4 deg RAdeg Right Ascension in decimal degrees (J2000)
15- 21 F7.4 deg DEdeg Declination in decimal degrees (J2000)
23- 25 I3 s Vexp V band exposure time
27- 33 F7.4 mag Vmag V band magnitude
35- 40 F6.4 mag e_Vmag 1σ error in Vmag
42- 43 I2 --- f_Vmag Photometry flag on Vmag (1)
45- 46 I2 s IcTime Ic band exposure time
48- 54 F7.4 mag Icmag Cousins I band magnitude
56- 61 F6.4 mag e_Icmag 1σ error in Icmag
63- 64 I2 --- f_Icmag Photometry flag on Icmag (1)
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Note (1): Photometry flags as follows:
-1 = unsaturated, uncrowded;
-2 = crowded, PSF fitting used;
-9 = likely saturated.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- Seq [1/11309] Running index number
7 I1 --- s [1/4] Source of spectroscopic data (1)
9- 15 F7.4 deg RAdeg Right Ascension in decimal degrees (J2000)
17- 23 F7.4 deg DEdeg Declination in decimal degrees (J2000)
25- 30 F6.2 --- SpT ?=-99 Numerical spectral type (G1)
32- 37 F6.2 --- e_SpT ?=-10 Uncertainty in SpT; given in subclasses
39- 45 F7.4 mag Jmag 2MASS/J band magnitude
47- 52 F6.4 mag e_Jmag 1σ error in Jmag
54- 60 F7.4 mag Hmag 2MASS/H band magnitude
62- 67 F6.4 mag e_Hmag 1σ error in Hmag
69- 75 F7.4 mag Ksmag 2MASS Ks band magnitude
77- 82 F6.4 mag e_Ksmag 1σ error in Ksmag
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Note (1): Spectroscopic data source is:
1 = Hectospec;
2 = Hydra;
3 = FAST;
4 = Slesnick et al. (2002, Cat. J/ApJ/576/880).
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- Seq [1/7465] Running index number
6- 12 F7.4 deg RAdeg Right Ascension in decimal degrees (J2000)
14- 20 F7.4 deg DEdeg Declination in decimal degrees (J2000)
22- 26 F5.2 --- SpT Numerical spectral type (G1)
28- 32 F5.2 --- e_SpT Uncertainty in SpT
34- 38 F5.3 mag E(B-V) E(B-V) interstellar reddening
40 I1 --- L Numerical luminosity class (G1)
42- 48 F7.4 mag Vmag Johnson V-band magnitude
50- 55 F6.4 mag e_Vmag 1σ error in Vmag
57- 64 F8.4 mag Icmag ?=-99 Cousins Ic band magnitude
66- 71 F6.4 mag e_Icmag ?=0 1σ error in Icmag
73- 79 F7.4 mag Jmag 2MASS/J band magnitude
81- 86 F6.4 mag e_Jmag 1σ error in Jmag
88- 94 F7.4 mag Hmag 2MASS/H band magnitude
96-101 F6.4 mag e_Hmag 1σ error in Hmag
103-109 F7.4 mag Ksmag 2MASS/Ks band magnitude
111-116 F6.4 mag e_Ksmag 1σ error in Ksmag
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1 A1 --- Per h= h Persei ; x= χ Persei;
column added by CDS (1)
3- 7 I5 --- Seq [1/13424] Member identification number (1)
9- 13 I5 --- Phot ?=0 Photometry running index number
(Seq from table 1)
15- 18 I4 --- Spec ?=0 Spectroscopy running index number
(Seq from table 3)
20 I1 --- Mm Membership type (2)
22- 28 F7.4 deg RAdeg Right Ascension in decimal degrees (J2000)
30- 36 F7.4 deg DEdeg Declination in decimal degrees (J2000)
38- 45 F8.4 --- SpT [10.4/68.3]?=-99 Numerical spectral type (G1)
47- 53 F7.4 mag Vmag V band magnitude
55- 60 F6.4 mag e_Vmag 1σ error in Vmag
62- 69 F8.4 mag Icmag ?=-99 Ic band magnitude
71- 76 F6.4 mag e_Icmag ?=0 1σ error in Icmag
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Note (1): h Persei given first and then followed by χ Persei.
Note (2): Membership type is coded as:
1=Spectroscopic Members;
2=Photometric Members;
3=Spectroscopic and Photometric Members.
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Global Notes:
Note (G1): Numerical spectral type:
* The numerical spectral type has the formalism:
6=O6 ... 10=B0 ... 20=A0 ... 30=F0 ... 42=G2 ... 55=K5 ... 68=M8.
* the luminosity classes are coded as:
1=supergiant (I); 3 =giant (III); 5=dwarf (V).
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History:
* 19-Apr-2010: From electronic version of the journal
* 31-Aug-2011: Fixed the errors in the description of the tables 2 and 3
(inversions of the photometry filters)
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 19-Apr-2010