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J/A+A/335/183 Pleiades low-mass stars rotational velocities (Queloz+ 1998)
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The rotational velocity of low-mass stars in the Pleiades cluster
Queloz D., Allain S., Mermilliod J.-C., Bouvier J., Mayor M.
<Astron. Astrophys. 335, 183 (1998)>
=1998A&A...335..183Q (SIMBAD/NED BibCode)
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ADC_Keywords: Stars, pre-main sequence; Clusters, open ; Radial velocities ;
Rotational velocities
Keywords: stars: activity - stars: evolution - stars: pre-main sequence -
Galaxy: open clusters and associations: individual: Pleiades
Abstract:
We present new vsini measurements for 235 low-mass stars in the
Pleiades. The differential rotational broadening has been resolved for
all the stars in our sample. These results, combined with previously
published measurements, provide a complete and unbiased rotation data
set for stars in the mass range from 0.6 to 1.2M_{sun}_. Applying a
numerical inversion technique on the vsini distributions, we derive
the distributions of equatorial velocities for low-mass Pleiades
members. We find that half of the Pleiades dwarfs with a mass between
0.6 to 1M_{sun}_ have rotation rates lower than 10km/s.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 34 139 *CORAVEL and ELODIE vsini measurements of Pleiades
stars from the Hertzsprung (1947AnLei..19a...1H, see
Cat. <I/90>) and Soderblom (1993,
Cat. <J/ApJS/85/315>) samples.
table4.dat 27 82 CORAVEL vsini measurement of stars located in
the corona of the Pleiades and recently selected
by Rosvick et al. (1992A&A...255..130R) and by
Mermilliod et al. (1997, Cat. <J/A+A/320/74>)
as cluster members.
table5.dat 38 16 ELODIE vsini and radial velocity measurements of
new members of the Pleiades corona.
tables.tex 395 125 LaTex version of the tables
tables.ps 72 565 PostScript version of the tables
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Note on table3.dat: Most of these stars had previously only vsini upper limits
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See also:
I/90 : Positions of 502 Stars in Pleiades Region (Eichhorn+ 1970)
J/A+A/320/74 : Radial velocities of Pleiades members (Mermilliod+ 1997)
J/ApJS/85/315 : F, G and K dwarf stars of the Pleiades (Soderblom+ 1993)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Star Star number (Cl Melotte 22 NNN in Simbad)
5 A1 --- m_Star Multiplicity index on Star for each component
of a SB2 system
6 A1 --- n_Star [+*] Note on Star (1)
8- 12 F5.3 mag B-V0 B-V_0_ colour index
14 A1 --- l_vsiniC Limit flag on vsiniC
15- 18 F4.1 km/s vsiniC ? CORAVEL rotational velocity
20- 22 F3.1 km/s e_vsiniC ? rms uncertainty on vsiniC
23 A1 --- n_vsiniC [nS] Note (2)
24- 28 F5.1 km/s vsiniE ? ELODIE rotational velocity
30- 33 F4.1 km/s e_vsiniE ? rms uncertainty on vsiniE
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Note (1): +: Binary systems with rotations synchronized to the orbital motion.
*: Suspected long period double line spectroscopic binary (unresolved)
Note (2): n: Stars detected as "no dip" by CORAVEL are unresolved very fast
rotators (vsini>60km/s)
S: SB2, double line spectroscopic binary where the two components are
unresolved
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Star Star name (1)
9 A1 --- n_Star [*] Note on Pels 39 (2)
11- 15 F5.3 mag mag (B-V)0
17 A1 --- l_vsini Limit flag on vsini
18- 21 F4.1 km/s vsini ? Rotational velocity
23- 25 F3.1 km/s e_vsini ? rms uncertainty on vsini
26 A1 --- n_vsini [nS] Note on vsini (3)
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Note (1): Pels NNN = CL* MELOTTE 22 PELS NNNN in Simbad
Ia 317 = Cl* Melotte 22 AK I-1-317 in Simbad
Ib NNN = Cl* Melotte 22 AK I-2-NNN in Simbad
AAA NNN = Cl* Melotte 22 AK AAA-NNN in Simbad
SNNNx = Cl* Melotte 22 TRU SNNN x in Simbad
SNN = Cl* Melotte 22 TRU SNN in Simbad
Note (2): *: Pels 39 lies slightly above the main sequence but doesn't show any
hint of binarity with radial velocities. However, its very small
vsini value is an indication that this star could be a non-member.
Note (3): n: Stars detected as "no dip" by CORAVEL are unresolved very fast
rotators (vsini>60km/s)
S: SB2, double line spectroscopic binary where the two components are
unresolved
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Pels Star name (CL* MELOTTE 22 PELS NNNN) in Simbad
10- 13 F4.2 mag (B-V)0 (B-V)_0_ colour index
15- 19 F5.1 km/s vsini Rotational velocity
21- 24 F4.1 km/s e_vsini rms uncertainty on vsini
26- 29 F4.2 km/s RV Radial velocity
30 A1 --- u_RV Uncertainty flag on RV
32- 36 F5.2 km/s O-C Velocity difference with the mean velocity of the
cluster corrected from the projection effect (1)
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Note (1): Note that, in order to use the convergent point measured by Rosvick et
al. (1992A&A...255..130R) to compute the (O-C), the ELODIE
measurements have been converted into the CORAVEL zero point
reference frame. The following velocity offset has been used:
V_E_-V_C_ = 0.48 - 1.45(B-V) + 0.53(B-V)^2^ (Udry et al., 1998,
in prep.).
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Acknowledgements: Jean-Claude Mermilliod <Jean-Claude.Mermilliod@obs.unige.ch>
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(End) Patricia Bauer [CDS] 18-Jun-1998