II/24ivo://CDS.VizieR/II/24CDSPeat D.W.2017-11-06T12:24:08Z2000-01-01T21:36:25ZCDS support team

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

cds-question@unistra.frvisible-astronomyh-alpha-photometrylate-type-starsdwarf-starsObservations are presented of the strength of the H-{alpha} absorption line in the spectra of approximately 600 northern F, G and K stars of differing luminosities and chemical compositions. Most of the stars in this catalogue were previously observed by Griffin and Redman (1960MNRAS.120..287G), Deeming (1960MNRAS.121...52D), and Griffin (1961MNRAS.122..181G). Data given in this catalog include HD number, MK spectral classification, high velocity, (B-V) color index, magnesium b ratio, sodium D line ratio and H-{alpha} ratio. Introduction: (Peat, 1964) The integrated light-intensity within a band defined by the wavelength limits 6545-6580A, centered on the wavelength of H-{alpha}, was measured by one photomultiplier. The combined integrated light intensity within the two comparison regions defined respectively by the wavelength limits 6477.5 to 6495.0A and 6630.0 to 6647.5A was measured by a second photomultiplier. The wavelengths were monitored using the bright neon emission at lambda 6402 produced by a neon discharge tube, and were held constant to within +-0.5A. Errors of the order of +- 2A in the wavelength setting, however, were found experimentally to have no effect on the results, and corrections for the Doppler shift due to the stellar radial velocity were therefore unnecessary. The "H-{alpha} ratio" R, was defined by the expression R = [B/B(L)]/[A/A(L)] where B, A represent the photomultiplier output counts for a star, in the side bands and H-{alpha} band respectively, and B(L), A(L) represent the corresponding counts for the lamp. One might expect this ratio to be partially determined by features, other than H-{alpha}, situated within the central and comparison regions of the stellar spectrum, but examination of a high resolution spectrogram of Arcturus (a K2 giant star typical of the stars on the observing program) taken by Griffin (1962) showed that these other features affected the H-{alpha} ratio by less than 0.3%. This is only of the same order as the estimated observational error in the H-{alpha} ratios, and we shall assume therefore that the H-{alpha} ratio is determined solely by the strength of the H-{alpha} absorption line. Griffin (1961MNRAS.122..181G) describes the three-channel spectrophotometer with which observations were made at the coude focus of the Cambridge Observatory 36 in reflecting telescope. Griffin and Redman (1960MNRAS.120..287G), Deeming (1960MNRAS.121...52D), and Griffin (1961MNRAS.122..181G) describe the method of Observation and reduction.1964MNRAS.128..435Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/II/24CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/22 : HRA Photometry of Late-Type stars II. (Peat 1966)II/63 : Balmer Lines Photometric Data (Mermilliod+ 1980)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=II/24https://vizier.iucaa.in/viz-bin/VizieR-2?-source=II/24http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=II/24https://vizier.cds.unistra.fr/viz-bin/votable?-source=II/24https://vizier.iucaa.in/viz-bin/votable?-source=II/24http://vizieridia.saao.ac.za/viz-bin/votable?-source=II/24GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table II/24/data (Photometric Results)https://vizier.cds.unistra.fr/viz-bin/conesearch/II/24/data?https://vizier.iucaa.in/viz-bin/conesearch/II/24/data?http://vizieridia.saao.ac.za/viz-bin/conesearch/II/24/data?GETtext/xml+votable180.050000true1.6532729.02150110.0055555555555555566/79 128 137 290 341 377 400 405 428 433 587 647 684 737 841 846 888 894 915 975 998 1082 1111 1143 1207 1218 1249 1286 1297 1310 1358 1360 1408 1410 1603 1696 1728 1770 1875 1938 1997 2031 2089 2202 2327 2433 2440 2460 2472 2476 2489 2490 2499 2525 2549 2619 2622 2678 2755 2770 2828 2834 2837 2921 2923 2927 2940 2958 2970 2973 3001 3026 3032 3034 3037 3048 3064 3066 3071 3077 3087 3091 3138 3146 3208 3229 3268 3276 3301 3324 3390 3616 3619 3623 3632 3639 3641 3657 3659 3667 3682 3696 3719 3733 3749 3762 3777 3780 3799 3813 3878 4185 4256 4444 4506 4512 4533 4574 4578 4591 4690 4711 4772 4820 4869 4923 4929 4942 4969 5009 5010 5073 5109 5239 5245 5349 5362 5382 5442 5530 5535 5587 5670 5676 5694 5726 5776 5833 5950 5982 6039 6041 6126 6166 6173 6183 6196 6203 6204 6210 6219 6224 6226 6241 6251 6273 6282 6298 6381 6472 6493 6510 6519 6727 6730 6740 6761 6766 6807 6825 6827 6852 6882 7039 7040 7101 7113 7131 7136 7177 7384 7499 7528 7542 7558 7595 7619 7622 7760 7795 7803 7848 8198 8278 8333 8372 8470 8518 8523 8556 8644 8663 8671 8689 8704 8756 8767 8773 8781 8788 8790 8834 8882 8986 9012 9061 9083 9085 9127 9197 9213 9216 9219 9237 9317 9373 9403 9419 9520 9553 9610 9620 9662 9717 9753 9792 9801 9843 9873 9874 10003 10055 10101 10161 10266 10310 10380 10407 10450 10522 10609 10784 10834 10886 10914 10926 10997 11142 11176 11247 11370 11405 11473 11488 11492 11547 11795 11885 11929 12460 12464 12477 12516 12526 12544 12604 12613 12720 12735 12748 12784 12792 12856 12953 12956 12960 12962 12975 12982 13007 13018 13025 13033 13038 13052 13099 13108 13114 13115 13158 13211 13222 13231 13282 13301 13332 13333 13415 13544 13550 13578 13643 13770 13777 13778 13801 13835 13882 13895 13947 14005 14007 14013 14060 14061 14062 14064 14084 14109 14110 14115 14131 14197 14198 14206 14220 14278 14280 14290 14319 14359 14387 14419 14441 14469 14520 14539 14557 14613 14616 14621 14630 14632 14646 14653 14690 14693 14696 14699 14715 14746 14767 14778 14797 14808 14834 14917 15012 15021 15185 15203 15217 15246 15249 15263 15273 15362 15364 15369 15384 15410 15441 15505 15511 15597 15628 15630 15672 15715 15719 15730 15747 15850 15901 16069 16148 16150 16259 17784 17852 17919 18123 18139 18166 18204 18227 18276 18315 18416 18593 18859 18893 18907 18911 19144 19157 19237 19825 19912 19921 19923 19930 19938 19973 19985 20015 20205 20254 20308 20311 20328 20376 20402 20432 21862 21940 21941 22214 22269 22335 22420 22450 22473 22900 22964 22988 23352 23421 23525 23533 23538 23539 23540 23542 23623 23695 23703 23731 23784 23822 23880 23921 23960 24020 24048 24062 24114 24151 24152 24212 24262 24302 24358 24374 24420 24570 25941 26228 26302 26385 26538 26552 26575 26595 27088 27366 27386 27444 27568 27752 27823 27955 27973 28014 28044 28173 28215 28276 28352 28436 28446 28539 28605 28664 30064 30171 30300 30398 30439 30518 30529 30541 30567 30578 30598 30665 30699 30708 30709 31101 31130 31187 31408 31428 31433 31475 31488 31576 31585 31619 31686 31720 31742 31751 31784 31842 31987 32023 32045 32087 32140 32158 32182 32186 32221 32243 32257 32291 32296 32348 32372 32397 32433 32458 32477 32533 32554 32556 32561 32562 32575 32645 32725 32731 32754 32757 47298 47357 47510https://cdsarc.cds.unistra.fr/viz-bin/moc/II/24?format=asciiOpticaldefaultII/24/dataPhotometric ResultsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHDHD (Cat. <III/135>) number of the starmeta.id;meta.mainintSpTypeSpectral classificationsrc.spTypecharlum[10/50]? Luminosity class indication (1)src.class.luminosityintnullableHV[ HVP] High Velocity (2)meta.notecharB-V? (B-V) color index (3)magphot.color;em.opt.B;em.opt.VfloatnullableMgb? Mg b ratio from Deeming (1960MNRAS.121...52D)spect.indexfloatnullableNaD? Sodium D line ratioA from Griffin (1961MNRAS.122..181G)spect.indexfloatnullableHa[0.96/1.2] H{alpha} ratio (R{alpha}) (4)meta.notefloatID[1/594]+ Star numbermeta.idintprimaryindexedSimbadSimbad column added by the CDSmeta.ref.urlchar_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