J/AJ/148/30 BVI photometry of 350 Pleiades stars (Kamai+, 2014)
New BVIc photometry of low-mass Pleiades stars: exploring the effects of
rotation on broadband colors.
Kamai B.L., Vrba F.J., Stauffer J.R., Stassun K.G.
<Astron. J., 148, 30 (2014)>
=2014AJ....148...30K 2014AJ....148...30K (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Associations, stellar ; Photometry, UBVRI
Keywords: catalogs - Hertzsprung-Russell and C-M diagrams -
open clusters and associations: individual: Pleiades -
stars: low-mass - stars: rotation - starspots
Abstract:
We present new BVIC photometry for 350 Pleiades proper motion
members with 9<V≲17. Importantly, our new catalog includes a large
number of K- and early M-type stars, roughly doubling the number of
low-mass stars with well-calibrated Johnson/Cousins photometry in this
benchmark cluster. We combine our new photometry with existing
photometry from the literature to define a purely empirical isochrone
at Pleiades age (~100Myr) extending from V=9 to 17. We use the
empirical isochrone to identify 48 new probable binaries and 14 likely
nonmembers. The photometrically identified single stars are compared
against their expected positions in the color-magnitude diagram (CMD).
At 100Myr, the mid K and early M stars are predicted to lie above the
zero-age main sequence (ZAMS) having not yet reached the ZAMS. We find
in the B-V versus V CMD that mid K and early M dwarfs are instead
displaced below (or blueward of) the ZAMS. Using the stars' previously
reported rotation periods, we find a highly statistically significant
correlation between rotation period and CMD displacement, in the sense
that the more rapidly rotating stars have the largest displacements in
the B-V CMD.
Description:
We targeted 350 proper motion Pleiades members within a range of
9<V≲17 for new homogeneous BVIc observations (Table 1). Target
stars were selected from the Stauffer et al. 2007 (J/ApJS/172/663)
catalog, which compiles all the photometry from the literature in the
BVIcJHK photometric bands for the ∼1400 proper motion members.
U.S. Naval Observatory optical observations were obtained over 36
nights from 2007 November 11 to 2009 January 31 with the 1.0m
Ritchey-Chretien telescope at the Flagstaff Station using a Tektronix
1024x1024 thinned, backside-illuminated CCD. The standard Johnson B
and V filters and a Kron-Cousins Ic filter were employed.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 123 350 New BVIc Pleiades photometry (corrected
version sent by the author)
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See also:
I/258 : Pleiades positions and proper motions (Wang+, 1996)
II/131 : Tonantzintla Pleiades Flare Stars (Haro+ 1982)
J/MNRAS/422/1495 : UKIDSS Galactic Clusters Survey Pleiades members
(Lodieu+ 2012)
J/MNRAS/408/475 : HATNet Pleiades Rotation Period Catalogue (Hartman+, 2010)
J/MNRAS/380/712 : ZYJHK photometry in Pleiades (Lodieu+, 2007)
J/ApJS/172/663 : Infrared observations of the Pleiades (Stauffer+, 2007)
J/A+A/416/125 : RI photometry in alpha Per and Pleiades (Deacon+, 2004)
J/MNRAS/313/347 : Pleiades low-mass stars and brown dwarfs (Pinfield+, 2000)
J/A+A/329/101 : Masses of Pleiades members (Raboud+ 1998)
J/A+A/337/403 : Low-mass stars evolutionary models (Baraffe+ 1998)
J/A+A/335/183 : Pleiades low-mass stars rotational velocities (Queloz+ 1998)
J/A+A/332/575 : Pleiades member list (Belikov+ 1998)
J/A+A/323/139 : K magnitude of Pleiades low-mass binaries (Bouvier+ 1997)
J/A+A/320/74 : Radial velocities of Pleiades members (Mermilliod+ 1997)
J/A+A/299/696 : Pleiades field Membership probabilities (Schilbach+, 1995)
J/A+AS/100/607 : Pleiades very low mass proper motion members (Hambly+, 1993)
J/ApJS/85/315 : F, G and K dwarf stars of the Pleiades (Soderblom+ 1993)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1 I1 h RAh Hour of Right Ascension (J2000) (1)
3- 4 I2 min RAm Minute of Right Ascension (J2000) (1)
6- 10 F5.2 s RAs Second of Right Ascension (J2000) (1)
12 A1 --- DE- Sign of the Declination (J2000) (1)
13- 14 I2 deg DEd Degree of Declination (J2000) (1)
16- 17 I2 arcmin DEm Arcminute of Declination (J2000) (1)
19- 23 F5.2 arcsec DEs Arcsecond of Declination (J2000) (1)
25- 30 F6.3 mag Vmag [8.7/17.9] The Johnson V band magnitude
32- 36 F5.3 mag e_Vmag The 1σ error in Vmag
38- 42 F5.3 mag B-V [0.36/1.84] The Johnson (B-V) color index
44- 48 F5.3 mag e_B-V The 1σ error in B-V
50- 54 F5.3 mag V-I [0.36/3.33] The Kron-Cousins (V-Ic) color index
56- 60 F5.3 mag e_V-I The 1σ error in V-I
62 I1 --- No [1/3] Number of observations
64 A1 --- Obs [abc] binary or non-member star (2)
66- 69 A4 --- --- [PELS]
70- 72 I3 --- PELS [3/192]? (Pels proper motion member) Identifier
in van Leeuwen et al. (1986A&AS...65..309V 1986A&AS...65..309V) (3)
74- 75 A2 --- --- [DH]
76- 78 I3 --- DH04 [1/912]? Identifier in Deacon & Hambly 2004
(J/A+A/416/125) (3)
80- 82 A3 --- --- [HCG]
83- 85 I3 --- H82 [6/519]? Identifier in Haro et al. 1982
(cat. II/131) (3)
87- 93 A7 --- BPL ? (Burrell Pleiades) Identifier in
Pinfield et al. 2000 (J/MNRAS/313/347) (3)
95- 96 A2 --- --- [SK]
97- 99 I3 --- S91 [17/802]? Identifier in Stauffer, Klemola et al.
(1991AJ....101..980S 1991AJ....101..980S) (3)
101-103 A3 --- --- [HHJ]
104-106 I3 --- H91 [291/439]? Identifier in Hambly et al.
(1991MNRAS.253....1H 1991MNRAS.253....1H) (3)
108-123 A16 --- OName Other stellar names (4)
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Note (1): The coordinates for the two objects DH797 (Cl* Melotte 22 DH 797 in
SIMBAD) and DH290 (Cl* Melotte 22 DH 290 in SIMBAD) were incorrect. DH797
and DH290 had the same coordinates that DH347 and DH209, respectively.
We corrected the coordinates for DH797 and DH290 using the coordinates from
SIMBAD.
Note (2): Observation flags as follows:
a = Binary identified in all color-magnitude diagram (CMDs);
b = Binary identified in 3 out of 4 color-magnitude diagrams (CMDs);
c = Probable non-member.
Note (3): Taken from Stauffer et al. 2007 (J/ApJS/172/663).
Note (4): Taken from Stauffer et al. 2007 (J/ApJS/172/663):
A = (Asiago flare star) see Haro et al. 1982 (cat. II/131);
AK = Artyukhina & Kalinina (1970TrSht..40....3A 1970TrSht..40....3A);
HII = Hertzprung (1947AnLei..19A...1H 1947AnLei..19A...1H);
MT = McCarthy & Treanor (1964RA......6..535M 1964RA......6..535M);
Tr = Trumpler (1921LicOB..10..110T 1921LicOB..10..110T).
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History:
* 14-Oct-2014: from electronic version of the journal
* 21-Dec-2015: coordinates for the two objects DH797 and DH290 corrected
from SIMBAD database in Table1
Acknowledgements:
* 14-Oct-2014: from journal electronic version
* 27-Nov-2014: a corrected version of Table1 was sent by the author
(Brittany L. Kamai)
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 14-Oct-2014