J/ApJ/647/303 Spectroscopic survey of hypervelocity stars (Brown+, 2006)
Hypervelocity stars. I. The spectroscopic survey.
Brown W.R., Geller M.J., Kenyon S.J., Kurtz M.J.
<Astrophys. J., 647, 303-311 (2006)>
=2006ApJ...647..303B 2006ApJ...647..303B
ADC_Keywords: Surveys ; Galaxies, nearby ; Radial velocities ; Photometry, SDSS
Keywords: galaxies: individual (Leo A, Draco) - Galaxy: halo -
Galaxy: stellar content - stars: horizontal-branch - white dwarfs
Abstract:
We discuss our targeted search for hypervelocity stars (HVSs), stars
traveling with velocities so extreme that dynamical ejection from a
massive black hole is their only suggested origin. Our survey, now
half-complete, has successfully identified a total of four probable
HVSs plus a number of other unusual objects. Here we report the two
most recently discovered HVSs: SDSS J110557.45+093439.5 and possibly
SDSS J113312.12+010824, traveling with Galactic rest-frame velocities
at least +508±12 and 418±10km/s, respectively.
Description:
Observations were obtained with the Blue Channel Spectrograph on the
6.5m MMT telescope. Observations were obtained on the nights of 2005
July 10-11, 2005 December 3-5, and 2006 February 22-25.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 61 7 Hypervelocity Stars
table2.dat 78 202 *Late B objects
table3.dat 69 44 *White dwarfs
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Note on table2.dat,table3.dat:
Stars identified as [BGK2006] JHHMMSS.ss+DDMMSS.s in Simbad
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See also:
J/ApJ/660/311 : Hypervelocity stars. II (Brown+, 2007)
J/ApJ/671/1708 : Hypervelocity stars. III (Brown+, 2007)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [HVS]
4 I1 --- HVS HVS number, [BGK2006] HV N in Simbad (1)
5 A1 --- n_HVS [a] a: Probable HVS
7- 11 F5.1 deg GLON Galactic longitude
12- 16 F5.1 deg GLAT Galactic latitude
18- 21 F4.1 mag g'mag SDSS g' magnitude
23- 26 I4 km/s Vrf Velocity in Galactic rest frame (2)
28- 30 I3 kpc Dist Heliocentric distance estimate
32- 34 I3 Myr tGC Travel time from the Galactic Center
36- 59 A24 --- Name Name of the star
61 I1 --- Ref [1/4]? Catalog Reference (3)
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Note (1): HVS4-HVS7 are from this targeted HVS survey.
Note (2): VRF=Vhelio+(10cosl*cosb+5.2sinl*cosb+7.2sinb)+220sinl*cosb
Note (3): References as follows:
1 = Brown et al., 2005ApJ...622L..33B 2005ApJ...622L..33B
2 = Hirsch et al., 2005A&A...444L..61H 2005A&A...444L..61H
3 = Edelmann et al., 2005ApJ...634L.181E 2005ApJ...634L.181E
4 = Brown et al., 2006ApJ...640L..35B 2006ApJ...640L..35B
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Byte-by-byte Description of file: table[23].dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Hour of Right Ascension (J2000)
4- 5 I2 min RAm Minute of Right Ascension (J2000)
7- 11 F5.2 s RAs Second of Right Ascension (J2000)
13 A1 --- DE- Sign of the Declination (J2000)
14- 15 I2 deg DEd Degree of Declination (J2000)
17- 18 I2 arcmin DEm Arcminute of Declination (J2000)
20- 23 F4.1 arcsec DEs Arcsecond of Declination (J2000)
25- 30 F6.3 mag g'mag SDSS g' band magnitude
32- 36 F5.3 mag e_g'mag Uncertainty in g'mag
38- 42 F5.3 mag (u'-g')0 SDSS dereddened u'-g' color index
44- 48 F5.3 mag e_(u'-g')0 Uncertainty in (u'-g')0
50- 55 F6.3 mag (g'-r')0 SDSS dereddened g'-r' color index
57- 61 F5.3 mag e_(g'-r')0 Uncertainty in (g'-r')0
63- 66 I4 km/s HV Heliocentric Velocity
68- 69 I2 km/s e_HV Uncertainty in HV
71- 74 F4.1 [Sun] [Fe/H] ? The [Fe/H] abundance (only in table2)
76- 78 F3.1 [Sun] e_[Fe/H] ? Uncertainty in [Fe/H] (only in table2)
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 08-Jul-2008