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    (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 BVI_C_ 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 ({approx}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:
--------------------------------------------------------------------------------
 FileName   Lrecl   Records   Explanations
--------------------------------------------------------------------------------
ReadMe         80         .   This file
table1.dat    123       350   New BVIc Pleiades photometry (corrected
                              version sent by the author)
--------------------------------------------------------------------------------

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
--------------------------------------------------------------------------------
   Bytes Format Units   Label Explanations
--------------------------------------------------------------------------------
       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 1{sigma} 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 1{sigma} 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 1{sigma} 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) (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) (3)
 101-103  A3    ---     ---   [HHJ]
 104-106  I3    ---     H91   [291/439]? Identifier in Hambly et al.
                              (1991MNRAS.253....1H) (3)
 108-123  A16   ---     OName Other stellar names (4)
--------------------------------------------------------------------------------
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);
  HII = Hertzprung (1947AnLei..19A...1H);
   MT = McCarthy & Treanor (1964RA......6..535M);
   Tr = Trumpler (1921LicOB..10..110T).
--------------------------------------------------------------------------------

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