Access to Astronomical Catalogues

← Click to display the menu
J/A+A/530/A28    Priority targets for the MUCHFUSS project       (Geier+, 2011)

The MUCHFUSS project - searching for hot subdwarf binaries with massive unseen companions. Survey, target selection and atmospheric parameters. Geier S., Hirsch H., Tillich A., Maxted P.F.L., Bentley S.J., Ostensen R.H., Heber U., Gaensicke B.T., Marsh T.R., Napiwotzki R., Barlow B.N., O'Toole S.J. <Astron. Astrophys., 530, A28 (2011)> =2011A&A...530A..28G
ADC_Keywords: Binaries, spectroscopic ; Stars, subdwarf ; Radial velocities Keywords: binaries: spectroscopic - subdwarfs Abstract: The project Massive Unseen Companions to Hot Faint Underluminous Stars from SDSS (MUCHFUSS) aims at finding sdBs with compact companions like supermassive white dwarfs (M>1.0M), neutron stars or black holes. The existence of such systems is predicted by binary evolution theory and recent discoveries indicate that they are likely to exist in our Galaxy. A determination of the orbital parameters is sufficient to put a lower limit on the companion mass by calculating the binary mass function. If this lower limit exceeds the Chandrasekhar mass and no sign of a companion is visible in the spectra, the existence of a massive compact companion is proven without the need for any additional assumptions. We identified about 1100 hot subdwarf stars from the SDSS by colour selection and visual inspection of their spectra. Stars with high velocities have been reobserved and individual SDSS spectra have been analysed. In total 127 radial velocity variable subdwarfs have been discovered. Binaries with high RV shifts and binaries with moderate shifts within short timespans have the highest probability of hosting massive compact companions. Atmospheric parameters of 69 hot subdwarfs in these binary systems have been determined by means of a quantitative spectral analysis. The atmospheric parameter distribution of the selected sample does not differ from previously studied samples of hot subdwarfs. The systems are considered the best candidates to search for massive compact companions by follow-up time resolved spectroscopy. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 46 69 Priority targets for follow-up table3.dat 88 17 Priority targets for follow-up (HRV subsample) table4.dat 88 52 Priority targets for follow-up (RRV subsample) tablea1.dat 80 89 Orbital parameters of all known hot subdwarf binaries from literature refs.dat 132 36 References
See also: J/A+A/442/1023 : Radial velocity of 17 bright subdwarf B stars (Edelmann+ 2005) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 19 A19 --- SDSS Object name ( 21- 34 A14 --- OName Other name 36- 39 F4.1 mag gmag g magnitude 41- 42 I2 --- Nsp Number of individual spectra 44- 46 I3 --- S/N S/N of the coadded spectra at ~=4100Å
Byte-by-byte Description of file: table[34].dat
Bytes Format Units Label Explanations
1- 19 A19 --- SDSS Object name ( 20 A1 --- n_Class [*d] Other analysis (1) 22- 27 A6 --- Class Binary class (2) 29- 33 I5 K Teff ?=- Effective temperature 35- 38 I4 K e_Teff ? rms uncertainty on Teff 40- 43 F4.2 [cm/s2] logg ?=- Surface gravity 45- 48 F4.2 [cm/s2] e_logg ? rms uncertainty on logg 50 A1 --- l_logy Limit flag on logy 51- 55 F5.2 [-] logy ?=- Helium abundance 57- 60 F4.2 [-] e_logy ? rms uncertainty on logy 61- 64 F4.1 kpc d ?=- Heliocentric distance 66- 68 F3.1 kpc E_d ? Error on d (upper value) 70- 72 F3.1 kpc e_d ? Error on d (lower value) 74- 76 I3 km/s DRV Radial velocity shift 78- 79 I2 km/s e_DRV rms uncertainty on DRV 81- 88 F8.3 d Dt Time interval, Δt
Note (1): Note as follows: * = binary system analysed in Geier et al. (2011A&A...526A..39G) d = Atmospheric parameters (Teff=39400K, logg=5.64, logy=-0.55) have been determined by Stroer et al. (2007A&A...462..269S) Note (2): classes are sdO, sdOB, sdB/DA, sdB, He-sdO or He-sdB.
Byte-by-byte Description of file: tablea1.dat
Bytes Format Units Label Explanations
1- 22 A22 --- Name Object name 24- 29 A6 --- n_Name Notes about the nature of the subdwarf (1) 32- 43 F12.9 d Per Period 46- 51 F6.2 km/s gamma ?=- System velocity 53- 57 F5.2 km/s e_gamma ? rms uncertainty on gamma 60- 65 F6.2 km/s K ?=- Radial velocity semi-amplitude 67- 71 F5.2 km/s e_K ? rms uncertainty on K 72 A1 --- --- [/] 73- 74 I2 km/s K2 ? Second component radial velocity semi-amplitude 76- 77 I2 km/s e_K2 ? rms uncertainty on K2 79- 80 I2 --- Ref Reference, in refs.dat file
Note (1): Notes as follows: p = sdB pulsators r = binaries where with reflection effect ec = eclipsing systems el = systems with light variations caused by ellipsoidal deformation. * = post-RGB stars without core helium-burning d = double-lined binary consisting of two helium rich sdBs. The RV semi-amplitudes of both components are given.
Byte-by-byte Description of file: refs.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Ref Reference number 4- 22 A19 --- BibCode BibCode 24- 43 A20 --- Aut Author's name 46-132 A87 --- Com Comments
History: From electronic version of the journal References: Geier et al., 2011A&A...526A..39G Tillich et al., 2011A&A...527A.137T Geier et al., 2011ApJ...731L..22G
(End) Patricia Vannier [CDS] 30-Aug-2011
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service