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J/A+A/440/1061      Southern red high proper motion objects    (Lodieu+, 2005)

Spectroscopic classification of red high proper motion objects in the Southern Sky. Lodieu N., Scholz R.-D., Mccaughrean M.J., Ibata R., Irwin M., Zinnecker H. <Astron. Astrophys., 440, 1061-1078 (2005)> =2005A&A...440.1061L
ADC_Keywords: Stars, late-type; Proper motions ; Photometry, photographic ; Photometry, infrared ; Radial velocities ; Space velocities Keywords: surveys - stars: kinematics - stars: late-type - stars: low-mass, brown dwarfs - techniques: photometric - techniques: spectroscopic Abstract: We present the results of spectroscopic follow-up observations for a sample of 71 red objects with high proper motions in the range 0.08-1.14 arcsec/yr as detected using APM and SuperCOSMOS Sky Surveys (SSS) measurements of multi-epoch photographic Schmidt plates. Red objects were selected by combining the photographic BjRI magnitudes with 2MASS near-infrared JHKs magnitudes. Some 50 of the 71 spectroscopically classified objects turn out to be late-type (>M6) dwarfs and in more detail, the sample includes 35 ultracool dwarfs with spectral types between M8 and L2, some previously reported, as well as five M-type subdwarfs, including a cool esdM6 object, SSSPM J0500-5406. Distance estimates based on the spectral types and 2MASS J magnitudes place almost all of the late-type (>M6) dwarfs within 50pc, with 25 objects located inside the 25pc limit of the catalogue of nearby stars. Most of the early-type M dwarfs are located at larger distances of 100-200pc, suggesting halo kinematics for some of them. All objects with Halpha equivalent widths larger than 10 Angstroms have relatively small tangential velocities (<50km/s). Finally, some late-type but blue objects are candidate binaries. Description: Table main gives the names, coordinates (J2000), epoch, proper motions, and optical (BjRI) and near-infrared (JHKs) magnitudes for new, red proper motion objects published in this paper. Table obslog1 provides the observing logs for a subset of proper motion objects observed photometrically with FORS1 and ISAAC on the VLT. It includes observing dates, filters, and exposure times for each object. Table obslog2 gives the observing logs for a subset of proper motion objects followed-up spectroscopically in the optical with FORS1 and in the near-infrared with ISAAC. Observing dates and exposure times are listed for each object. Table obslog3 presents the observing logs for a subset of proper motion objects followed-up spectroscopically in the optical with ESO 3.6-m/EFOSC2 and in the near-infrared with NTT/SofI. Names, observing dates, and exposure times are listed for both wavelength ranges. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file main.dat 109 79 List of new, red proper motion objects (table1) obslog1.dat 88 32 Obs. logs: photometry with FORS1 & ISAAC (table2) obslog2.dat 73 22 Obs. logs: spectroscopy with FORS1 & ISAAC (table3) obslog3.dat 58 49 Obs. logs: photometry with EFOSC2 & SofI (table4) table5.dat 91 60 Results from optical spectra table6.dat 82 27 Results from near-infrared spectra table7.dat 97 15 Results the five new subdwarfs discovered
See also: J/A+A/421/763 : Liverpool-Edinburgh High-PM Catalogue (Pokorny+, 2004) Byte-by-byte Description of file: main.dat
Bytes Format Units Label Explanations
1- 2 I2 --- RN Running number 4- 19 A16 --- Name Name of the target 21- 23 A3 --- Note Note about the presence in other catalogues (1) 25- 26 I2 h RAh Right ascension (J2000.0) 28- 29 I2 min RAm Right ascension (J2000.0) 31- 35 F5.2 s RAs Right ascension (J2000.0) 37 A1 --- DE- Declination sign (J2000.0) 38- 39 I2 deg DEd Declination (J2000.0) 41- 42 I2 arcmin DEm Declination (J2000.0) 44- 47 F4.1 arcsec DEs Declination (J2000.0) 49- 55 F7.2 yr Epoch Epoch of observation 57- 61 I5 mas/yr pmRA Proper motion in right ascension (incl. sign) 63- 67 I5 mas/yr pmDE Proper motion in right ascension (incl. sign) 69- 70 I2 mas/yr e_pmRA Error on the proper motion in right ascension 72- 73 I2 mas/yr e_pmDE Error on the proper motion in declination 75- 79 F5.2 mag Bjmag BJ magnitude from SSS 81- 85 F5.2 mag Rmag R magnitude from SSS 87- 91 F5.2 mag Imag I magnitude from SSS 93- 97 F5.2 mag Jmag J magnitude from 2MASS 99-103 F5.2 mag Hmag ? H magnitude from 2MASS 105-109 F5.2 mag Ksmag ? Ks magnitude from 2MASS
Note (1): Notes "a" and "b" indicate that the object is also mentioned in the proper motion catalogue of Pokorny et al. (see J/A+A/421/763) and in the B1.0 catalogue (Monet et al., Cat. I/284), respectively.
Byte-by-byte Description of file: obslog1.dat
Bytes Format Units Label Explanations
1- 2 I2 --- RN Running number 4- 19 A16 --- Name Name of the target 21- 30 A10 "YYYY/MM/DD" ObsO Date of the observation in RI bands 32 I1 --- NExpR Number of exposure in R band 33 A1 --- --- [x] 34- 35 I2 s ExpR Exposure time in R band 38- 42 F5.2 mag Rmag R magnitude from VLT/FORS1 44 I1 --- NExpI Number of exposure in I band 45 A1 --- --- [x] 46- 47 I2 s ExpI Exposure time in I band 50- 54 F5.2 mag Imag I magnitude from VLT/FORS1 56- 65 A10 "YYYY/MM/DD" ObsJHK Date of the observation in JsHKs band 67 I1 --- NExpJHK Number of exposure in JsHKs bands 68 A1 --- --- [x] 69 I1 s ExpJHK Exposure time in JsHKs bands 72- 76 F5.2 mag Jsmag ? Js magnitude from VLT/ISAAC 78- 82 F5.2 mag Hmag ? H magnitude from VLT/ISAAC 84- 88 F5.2 mag Ksmag ? Ks magnitude from VLT/ISAAC
Byte-by-byte Description of file: obslog2.dat
Bytes Format Units Label Explanations
1- 2 I2 --- RN Running number 4- 19 A16 --- Name Name of the target 21- 30 A10 "YYYY/MM/DD" ObsO Date of the observation in Optical 32 I1 --- NExpO Number of exposure in Optical 33 A1 --- --- [x] 34- 36 I3 s ExpO Exposure time in Optical 39- 48 A10 "YYYY/MM/DD" ObsJHK Date of the observations in I band 50- 51 I2 --- NExpJ ? Number of exposure in J band 52 A1 --- --- [x] 53- 55 I3 --- ExpJ ? Exposure time in J band 58- 59 I2 --- NExpH ? Number of exposure in H band 60 A1 --- --- [x] 61- 63 I3 --- ExpH ? Exposure time in H band 66- 67 I2 --- NExpK ? Number of exposure in K band 68 A1 --- --- [x] 69- 71 I3 --- ExpK ? Exposure time in K band
Byte-by-byte Description of file: obslog3.dat
Bytes Format Units Label Explanations
1- 2 I2 --- RN Running number 4- 19 A16 --- Name Name of the target 21- 30 A10 "YYYY/MM/DD" ObsO Date of the observation in Optical band 32 I1 --- NExpO ? Number of exposure in Optical band 33 A1 --- --- [x] 34- 37 I4 s ExpO ? Exposure time in optical band 40- 49 A10 "YYYY/MM/DD" ObsNIR Date of the observation in NIR band 51 I1 --- NExpNIR ? Number of exposure in NIR band 52 A1 --- --- [x] 53- 55 I3 --- ExpNIR ? Exposure time in NIR band
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 2 I2 --- RN Running number 4- 19 A16 --- Name Name of the target 21- 25 F5.3 --- indHa Halpha index (1) 27- 30 F4.1 0.1nm EWHa ? Halpha equivalent width 31 A1 --- n_EWHa [*] * for flare 33- 37 F5.3 --- TiO5dM ? Value of the TiO5 spectral index 39- 42 A4 --- SpTiO5 Spectral type associated to the TiO5 index 45- 49 F5.3 --- VOadM Value of the VO-a spectral index 51- 55 A5 --- SpVOa Spectral type associated to the VO-a index 57- 61 F5.3 --- PC3dM Value of the PC3 spectral index 63- 66 A4 --- SpPC3 Spectral type associated to the PC3 index 68- 71 A4 --- SpComp Spectral type from the comparison with a template 73- 76 A4 --- SpType Final adopted spectral type 78- 82 F5.1 pc distdM Estimated distance 84- 87 F4.1 pc e_distdM Error on the distance 89- 91 I3 km/s vtdM Tangential velocity
Note (1): Halpha index which measures the strength of the H emission line compared to the neighbouring continuum.
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 2 I2 --- RN Running number 4- 19 A16 --- Name Name of the target 21- 24 F4.2 --- H2OA Value for the H2OA spectral index 26- 29 A4 --- SpH2OA Spectral type associated to the H2OA index 31- 34 F4.2 --- H2OB Value for the H2OB spectral index 36- 39 A4 --- SpH2OB Spectral type associated to the H2OB index 41- 45 F5.2 --- K1 ? Value for the K1 spectral index 47- 50 A4 --- SpK1 Spectral type associated to the K1 index 52- 55 F4.2 --- Q Value for the Q_Hband spectral index 57- 60 A4 --- SpQ Spectral type associated to the Q_Hband index 62- 65 A4 --- SpMean Mean near-infrared spectral type 67- 70 A4 --- SpType Final adopted spectral type (1) 72- 75 F4.1 pc distIR ? Estimated distance from the NIR spectral types 77- 79 F3.1 pc e_distIR ? Error on the distance 81- 82 I2 km/s vtIR ? Tangential velocity
Note (1): Final adopted spectral types are derived from the optical spectrum when available otherwise they are derived from the direct comparison with a near-infrared template.
Byte-by-byte Description of file: table7.dat
Bytes Format Units Label Explanations
1- 2 I2 --- RN Running number 4- 19 A16 --- Name Name of the target 21- 25 F5.3 --- TiO5sd Value of the TiO5 spectral index 27- 31 F5.3 --- CaH1sd ? Value of the CaH1 spectral index 33- 37 F5.3 --- CaH2sd Value of the CaH2 spectral index 39- 43 F5.3 --- CaH3sd Value of the CaH3 spectral index 45- 51 A7 --- SpType Spectral type for subdwarfs and extreme subdwarfs 53 A1 --- r_distsd [123] Source for distance estimate (1) 55- 57 I3 pc distsd Distance estimates 59- 60 I2 pc e_distsd Error on the distance estimates 62- 64 I3 km/s vt Tangential velocity 66- 69 I4 km/s RV ? Radial velocity 71- 72 I2 km/s e_RV ? Error on the radial velocity 74- 77 I4 km/s UVel Space motion : U component 79- 80 I2 km/s e_UVel Error on the U space motion 82- 85 I4 km/s VVel Space motion : V component 87- 89 I3 km/s e_VVel Error on the V space motion 91- 94 I4 km/s WVel Space motion : W component 96- 97 I2 km/s e_WVel Error on the W space motion
Note (1): Three different distances, tangential velocities, and space motions are listed for each subdwarfs, numbered as follows: 1 = a model-dependent distance estimate according to Baraffe et al. (1997A&A...327.1054B) 2 = a distance estimate using comparison objects from Gizis (1997AJ....113..806G) 3 = a distance estimate based on empirical relationship between spectral types and absolute Ks magnitudes from Lepine et al. (2003AJ....125.1598L)
Acknowledgements: Nicolas Lodieu
(End) Nicolas Lodieu [University of Leicester, UK] 16-Nov-2005
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