J/A+A/475/677ivo://CDS.VizieR/J/A+A/475/677doi:10.26093/cds/vizier.34750677CDSSchroeder C.Schmitt J.H.M.M.2017-07-03T14:25:36Z2008-03-01T22:26:57ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.fra-starsx-ray-sourcesBeing fully radiative, stars of spectral type A are not expected to harbor magnetic dynamos and hence such stars are not expected to produce X-ray emission. Indeed, while the X-ray detection rate of such stars in X-ray surveys is low, it is not zero and some of the brighter A-type stars have been detected on different occasions and with different instruments. To study systematically the puzzle of the X-ray emitting A-type stars, we carried out an X-ray study of all A-type stars listed in the Bright Star Catalogue using the ROSAT public data archive. We found a total of 312 bright A-type stars positionally associated with ROSAT X-ray sources; we analyzed the X-ray light curves as well as searched for evidence of RV variations to identify possible late-type companions producing the X-ray emission. In this paper we present a list of X-ray active A-type stars, including the collected data about multiplicity, X-ray luminosity and spectral peculiarities.2007A&A...475..677Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/475/677CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)IX/29 : ROSAT All-Sky Survey Faint Source Catalog (Voges+ 2000)IX/28 : ROSAT HRI Pointed Observations (1RXH) (ROSAT Team, 2000)III/135 : Henry Draper Catalogue and Extension (Cannon+ 1918-1924; ADC 1989)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/475/677https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/475/677http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/475/677https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/475/677https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/475/677http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/475/677GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/475/677/stars (List of X-ray associated stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/475/677/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/475/677/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/475/677/stars?GETtext/xml+votable180.050000true10.8384939-57.463060.0055555555555555566/119 351 811 871 892 980 1001 1121 1146 1283 1287 1293 1318 1397 1412 1521 1855 1922-1923 1939 1955 1967 1973 2043 2536 2762 2973 3519 3594 3647 3678 3710 3737 3794 3849 3969 4124 4224 5116 5223 5423 5428 5450 5631 5717 5762 6340 6646 6921 7138 7205 7401 7701 7865 7992 8118 8124 8354 8474 8510 8687 8767 8876 9096 9458 9504 9510 9521 9683 9716 9751 9995 10000 10067 10096 10130 10614 10741 10783 10822 11109 11120 11354 11356 11376 11788 11851 12031 12264 12698 13072 13210 13763 13881 13969 14218 14640 14666 14677 14797 14814 14835 14899 14906 14908 15144 15330 15348 15533 15583 15760 15819 15875 15946 16118 16240 16289 16305 16312 16543 16704 17322 17783 18210 18311 18660 19025 19092 19271 19318 19613 19825 20047 20125 20725 20940 21364 21788 21834 22201 22250 22300 22576 22822 22849 22910 22920 23071 23377 23403 23493 23526 23538 23546-23547 23557 23658 23668 23765 23864 23870 24315 24562 25138 25199 25873 25973 26024 26141 26378 26406 26736 27010 27794 27826 27887 27910 27956 28049 28481 28517 28611 29035 29095 29161 29221 29374 29380 29454 29540 30303 30315 30328 30543 30565 30580 30655 30914 31284 31544 31556 31849 31929 32087 32127 32515 32542 32613 33039 33111 33193 33716 33920 34054 34509 34538 34823 34873 35149 35165 35836 35973 35989 36036 36563 36946 37012 37101 37108 37293 37314 37497 37660 37765 37779 38015-38016 38084 38223 38287 38635 38929 39008 39052 39491 39502 39593 39611 39625 39649 39692 39832 40606 40826 40963 40984 41465 41633 41666 41918 41942 42270 42366 42611 42645 42673 42684 42808 42861 42874 42988 43004 43018 43093 43293 43420 43469 43630 43677 44329 44435 45249 45589 45746 45927 46084 46096 46281 46299 46507 46768 46908 46982 47349 47357 48088 48505 48552 48589 48856 48874https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/475/677?format=asciiX-raydefaultJ/A+A/475/677/starsList of X-ray associated starsNotes[1/3]? Notes (6)meta.noteintnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintn_HRSimbad column added by the CDSmeta.code.multipcharHRHR number, from the Bright Star Catalog <V/50>meta.id;meta.mainintBinBinarity flag (1)meta.code.multipcharvsini? Rotational velocity or lower value of rotational velocity when intervalkm/sphys.veloc.rotatintnullablevsiniu? Upper value of rotational velocity when intervalkm/sphys.veloc.rotat;stat.maxintnullablel_SepLimit flag on Sepmeta.code.errorcharSep? Separation for visual binary systemsarcsecpos.distance;src.orbitaldoublenullableSep2? Second value of separation for visual binary systemsarcsecpos.distance;src.orbitalfloatnullablen_Sep2Note on Separation valuesmeta.notecharDmag? Difference in the magnitude between the star and its closest companionmagphot.mag;arith.difffloatnullableDmag2? Second value of difference in the magnitude between the A star and its closest companionmagphot.mag;arith.difffloatnullablen_DmagAdditional informations on Dmagmeta.notecharSpTypeMK spectral types of the componentssrc.spTypecharDist? Distance of the star as given by Hipparcos (Cat. I/239) parallaxespcpos.distance;pos.heliocentricintnullableObsCatalog flag indicating in which observation mode the star has been observed (2)meta.id;instrcharCRCount rate of the associated X-ray source (3)ct/sphot.count;em.X-raydoublee_CR? Error of the count rate (4)ct/sstat.errordoublenullableLX? X-ray luminosity (5)1e+20Wphys.luminosity;em.X-rayfloatnullableSimbadSimbad column added by the CDSchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main