J/A+A/620/A141 Physical properties of AM CVn stars (Ramsay+, 2018)
Physical properties of AM CVn stars: New insights from Gaia DR2.
Ramsay G., Green M.J., Marsh T.R., Kupfer T., Breedt E., Korol V.,
Groot P.J., Knigge C., Nelemans G., Steeghs D., Woudt P., Aungwerojwit A.
<Astron. Astrophys. 620, A141 (2018)>
=2018A&A...620A.141R 2018A&A...620A.141R (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Parallaxes, trigonometric ; Proper motions ;
Photometry, SDSS
Keywords: accretion, accretion disc - stars: distances - white dwarfs
Abstract:
AM CVn binaries are hydrogen deficient compact binaries with an
orbital period in the 5-65min range and are predicted to be strong
sources of persistent gravitational wave radiation. Using Gaia, Data
Release 2, we present the parallaxes and proper motions of 41 out of
the 56 known systems. Compared to the parallax determined using the
HST, Fine Guidance Sensor we find that the archetype star, AM CVn, is
significantly closer than previously thought. This resolves the high
luminosity and mass accretion rate which models had difficulty in
explaining. Using Pan-STARRS1 data we determine the absolute magnitude
of the AM CVn stars. There is some evidence that donor stars have a
higher mass and radius than expected for white dwarfs or that the
donors are not white dwarfs. Using the distances to the known AM CVn
stars we find strong evidence that a large population of AM CVn stars
has yet to be discovered. As this value sets the background to the
gravitational wave signal of LISA, this is of wide interest. We
determine the mass transfer rate for 15 AM CVn stars and find that the
majority has a rate significantly greater than expected from standard
models. This is further evidence that the donor star has a greater
size than expected.
Description:
For the first time we have reliable distances to more than a few
AMCVn stars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table.dat 632 55 Data on 55 AM CVn stars
table.fits 2880 16 Fits version of the table
refs.dat 116 53 References
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
II/349 : The Pan-STARRS release 1 (PS1) Survey - DR1 (Chambers+, 2016)
V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)
Byte-by-byte Description of file: table.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Source Source name (Source)
17- 55 A39 --- AName Alternative name (Alt name)
57- 58 I2 h RAh Right ascension (J2000) (RA_J2000)
60- 61 I2 min RAm Right ascension (J2000) (RA_J2000)
63- 67 F5.2 s RAs Right ascension (J2000) (RA_J2000)
69 A1 --- DE- Declination sign (J2000) (Dec_J2000)
70- 71 I2 deg DEd Declination (J2000) (Dec_J2000)
73- 74 I2 arcmin DEm Declination (J2000) (Dec_J2000)
76- 79 F4.1 arcsec DEs Declination (J2000) (Dec_J2000)
81- 82 I2 h RAGh ? Gaia right ascension (ICRS)
at epoch 2015.5 (RA_J2015.5)
84- 85 I2 min RAGm ? Gaia right ascension (ICRS)
at epoch 2015.5 (RA_J2015.5)
87- 91 F5.2 s RAGs ? Gaia right ascension (ICRS)
at epoch 2015.5 (RA_J2015.5)
93 A1 --- DEG- Gaia declination sign (ICRS)
at epoch 2015.5 (DE_J2015.5)
94- 95 I2 deg DEGd ? Gaia declination (ICRS)
at epoch 2015.5 (DE_J2015.5)
97- 98 I2 arcmin DEGm ? Gaia declination (ICRS)
at epoch 2015.5 (DE_J2015.5)
100-103 F4.1 arcsec DEGs ? Gaia declination (ICRS)
at epoch 2015.5 (DE_J2015.5)
105-123 I19 --- GDR2 ?=- Gaia DR2 source ID (GDR2sourceID)
125-131 F7.5 d Per ? Period in days (Period(d))
133-136 F4.1 min Perm ? Period in minutes (Period)
138-149 A12 --- f_Per Period flag (Period flag) (1)
151 A1 --- Outbst? [YN?] does it show outbursts? (Outbursts?)
153-168 A16 --- magRange Range in magnitude (Mag.Range)
170-177 A8 --- r_magRange Reference, in refs.dat file (Reference)
179-184 F6.3 mas Plx ? Parallax from GDR2 (Parallax)
186-190 F5.3 mas e_Plx ? Parallax error (Parallaxerr)
192-197 F6.1 pc Dist ? Distance. see paper for details (Distance)
199-203 F5.1 pc e_Dist ? Distance error (Disterr)
205-209 F5.3 mag E(B-V) Extinction see paper for details (E(B-V))
211-214 F4.2 mag Ag Reddening in g band see paper for details (Ag)
216-220 F5.2 mag gmagq ? Quiescent g magnitude (g_q)
222-226 F5.2 mag gMAG ? Absolute g magnitude (M_g)
228-231 F4.2 mag e_gMAG ? Absolute g magnitude error (Mgerr)
233-244 E12.6 mJy FFUV ? Galex FUV flux (FUVfluxmJy)
246-257 E12.6 mJy e_FFUV ? Galex FUV flux error (FUV_fluxerr)
259-270 E12.6 mJy FNUV ? Galex NUV flux (NUVfluxmJy)
272-283 E12.6 mJy e_FNUV ? Galex NUV flux error (NUV_fluxerr)
285-289 F5.2 mag uSmag ? SDSS u magnitude (SDSS_u)
291-294 F4.2 mag e_uSmag ? SDSS u magnitude error (SDSSuerr)
296-300 F5.2 mag gSmag ? SDSS g magnitude (SDSS_g)
302-305 F4.2 mag e_gSmag ? SDSS g magnitude error (SDSSgerr)
307-311 F5.2 mag rSmag ? SDSS r magnitude (SDSS_r)
313-316 F4.2 mag e_rSmag ? SDSS r magnitude error (SDSSrerr)
318-322 F5.2 mag iSmag ? SDSS i magnitude (SDSS_i)
324-327 F4.2 mag e_iSmag ? SDSS i magnitude error (SDSSierr)
329-333 F5.2 mag zSmag ? SDSS z magnitude (SDSS_z)
335-338 F4.2 mag e_zSmag ? SDSS z magnitude error (SDSSzerr)
340-345 F6.3 mag gPmag ? Panstarrs1 g magnitude (PS1_g)
347-351 F5.3 mag e_gPmag ? Panstarrs1 g magnitude error (PS1gerr)
353-358 F6.3 mag rPmag ? Panstarrs1 r magnitude (PS1_r)
360-364 F5.3 mag e_rPmag ? Panstarrs1 r magnitude error (PS1rerr)
366-371 F6.3 mag iPmag ? Panstarrs1 i magnitude (PS1_i)
373-377 F5.3 mag e_iPmag ? Panstarrs1 i magnitude error (PS1ierr)
379-384 F6.3 mag zPmag ? Panstarrs 1 z magnitude (PS1_z)
386-390 F5.3 mag e_zPmag ? Panstarrs1 z magnitude error (PS1zerr)
392-397 F6.3 mag yPmag ? Panstarrs 1 y magnitude (PS1_y)
399-403 F5.3 mag e_yPmag ? Panstarrs1 y magnitude error (PS1yerr)
405-410 F6.3 mag uMmag ? Skymapper u magnitude (SkyM_u)
412-416 F5.3 mag e_uMmag ? Skymapper u magnitude error (SkyMuerr)
418-423 F6.3 mag vMmag ? Skymapper v magnitude (SkyM_v)
425-429 F5.3 mag e_vMmag ? Skymapper v magnitude error (SkyMverr)
431-436 F6.3 mag gMmag ? Skymapper g magnitude (SkyM_g)
438-442 F5.3 mag e_gMmag ? Skymapper g magnitude error (SkyMgerr)
444-449 F6.3 mag rMmag ? Skymapper r magnitude (SkyM_r)
451-455 F5.3 mag e_rMmag ? Skymapper r magnitude error (SkyMrerr)
457-462 F6.3 mag iMmag ? Skymapper i magnitude (SkyM_i)
464-468 F5.3 mag e_iMmag ? Skymapper i magnitude error (SkyMierr)
470-475 F6.3 mag zMmag ? Skymapper z magnitude (SkyM_z)
477-481 F5.3 mag e_zMmag ? Skymapper z magnitude error (SkyMzerr)
483-632 A150 --- Notes Notes (Notes)
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Note (1): Period flag as follows:
orb = orbital
sh = superhump
est rec = estimated from recurrence time
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- Ref Reference code
5- 23 A19 --- BibCode BibCode
25- 47 A23 --- Aut Author's name
49-116 A68 --- Com Comments
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Acknowledgements:
Gavin Ramsay, Gavin.Ramsay(at)Armagh.ac.uk
(End) Patricia Vannier [CDS] 25-Oct-2018