COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS Number 761 Konkoly Observatory Budapest 1973 January 23 NEED OF PLANNED OBSERVATIONS OF MAGNETIC STARS To evaluate the reliability of each class of models invoked to interpret the behaviour of magnetic stars, the variation curves of magnetic field intensity, radial velocity and brightness are needed (Blanco et al. 1972). At present about 400 stars are considered magnetic or suspected magnetic. Among these, Zeeman measurements are available for 128 stars. These stars are listed in Table I if, at least for a Zeeman measurement, the probable error is less than one third of the measure itself, otherwise they are listed in Table II. In both tables the types of available observations for which periodic curves do exist, are indicated as follows: H = magnetic field intensity curves V_r = radial velocity curves l = photometric curves W_lambda = spectral line intensity curves An asterisk in the l column denotes the stars being photoelectrically observed at the Catania Observatory. From Table I it is evident that only far a few stars magnetic field intensity, radial velocity and brightness curves are available; furthermore the various kinds of observations have been carried out at very different epochs. In the present conditions any attempt to evaluate the reliability of the available models seems to be extremely precarious. The need of an international planning in the field of magnetic star observations (simultaneous magnetic field intensity and brightness observations) is evident. Osservatorio Astrofisico C. BLANCO, F.A. CATALANO, Catania - Italia G. GODOLI and S. VACCARI December 30, 1972 Table I ---------------------------------------------------------------------- Star other Available periodic designations S_p curves ---------------------------------------------------------------------- 1 HD 2453 A1_p * 2 4174 EG And gM2ep 1 3 8441 A2p H V_r 1 4 9996 HR 465 A0p H V_r 1 W_lambda 5 10221 HR 478=43 Cas A0p 6 10783 UZ Psc A2p H V_r 1 7 11187 A0p 8 15144 HR 710 A4p H V_r 1 9 18296 HR 873=21 Per=LT Per A0p H V_r 1 W_lambda 10 19445 A8p 11 20210 HR 976 A6pm V_r 12 22374 9 Tau A1p 13 22649 HR 1105 S5 14 24712 HR 1217 A8p H W_lambda 15 25354 A0p H V_r 1 16 25823 HR1268=41 Tau=GS Tau A0p H V_r 1 17 27962 HR1389=68 Tau A2IVm 18 30466 A0p V_r 1 19 32633 HZ Aur B9p H V_r 1 20 33254 HR 1672=16h Ori A2-F2m V_r 21 33904 HR 1702=5 mu Lep B9p 22 42474 WY Gem M3ep (+B3) 23 42616 A2p 24 49976 HR 2534 A0p 25 50169 A4p 26 53791 HR 2671=R Gem S3e 1 27 62140 HR 2977=49 Cam gF0p 28 63700 HR 3045=7 xi Pup G0I-G3Ib 29 64486 HR 3082 A0p 30 65339 HR 3109=53 Cam=AX Cam A3p H V_r 1 31 71866 TZ Lyn A0p H 1 32 72968 HR 3398=3 Hya A2pm H 1* 33 74521 HR 3465=49 Cnc A1p H V_r 1 34 77350 HR 3595=69 nu Cnc B9p 35 78316 HR 3623=76K Cnc B8p H V_r 1 36 81009 HR 3724 A2 V_r 37 89822 HR 4072 A0p V_r * 38 90569 HR 4101=45 Leo A1p 39 98088 HR 4369 A9p H V_r * 40 108662 HR 4752=17 Com=AI Com A0p H V_r 1 41 110066 HR 4816 A3p 42 110073 HR 4817=1 Cen B8p 43 110380-79 HR 4826=29gamma1VirF0V 44 111133 HR 4854 A2p H V_r 1 W_lambda 45 112413 HR 4915=12alpha^2 CVn A0p H V_r 1 W_lambda 46 HD 115708 A2p 47 118022 HR 5105=78Vir=CWVir A2p H V_r 1 48 125248 HR 5355=CS Vir A1p H V_r 1 W_lambda 49 126515 A2p H * 50 129174 HR 5475=29pi^1 Boo B9p W_lambda 51 130559 HR 5523=7mu Lib A1p 52 133029 HR 5597 A0p H 53 134793 A3p * 54 135297 A0p 55 137909 HR 5747=3beta CrB A9p H V_r 1 56 137949 33zeta^2 Lib F0p H * 57 143807 HR 5971=14iota CrB A0p 58 149911 HR 6179 A0p * 59 152107 HR 6254=52 Her A3p 60 153286 A2-Fpm 61 153882 HR 6326=V451 Her A3p H V_r 1 62 165474 HR 6758 A6p+A0 63 171586 A2p 64 173524 HR 7049=46 Dra A0 V_r 65 173650 HR 7058=V535 Her A0p H V_r 1 66 174933 HR 7113=112 Her B9II-III H V_r 67 176232 HR 7167=10 Aql A4p H V_r 1 68 179761 HR 7287=21 Aql B8p 1 69 182989 RR Lyr A3-F1 H V_r 1 70 184552 HR 7431 51h^1 Sgr A3-F5m V_r 71 187474 HR 7552 A0p H 72 188041 HR 7575 A6p H V-r 1 73 191742 A6p 74 192913 A0p 75 196502 HR 7879=73Dra=AFDra A2p H V_r 1 W_lambda 76 201601 HR 8097=5gamma Equ A9p H V_r 1 77 203006 HR 8151=theta^1Mic A2p 1 78 204075 HR 8204=34zetaCap G4-5p 79 207757 AG Peg WN6+M1-3II-III 80 208816 HR 8383= VV Cep M2Iaep+B9p V-r 1 81 215038 GQ Cep A0p 1 82 215441 GL Lac A0p H V-r 1 83 216386 HR 8698=73lambdaAqr M2III 84 221507 HR 8937=beta Scl B9p 85 224801 HR 9080=CG And A0p 1 ------------------------------------------------------------------- Table II -------------------------------------------------------------------------------- spectral available Star other designations type periodic curves -------------------------------------------------------------------------------- 1 HD 358A HR 15=21 alpha And= deltaPeg B9p V_r 1 2 4778 HR 234 A0p 1 3 5797 A0 4 12288 A0p 5 18078 A0p 6 20283 HR 979B 7 25267 HR 1240= 36 tau^9 Eri A0p V_r 8 27376 HR 1347= 41 Eri B8.5V V_r 9 29139 HR 1457= 87 alpha Tau. K5III 1 10 34452 HR 1732= IQ Aur B9p 1 W_lambda 11 40312 HR 2095= 37 theta Aur B9.5p 12 43819 HR 2258 B9p 13 45677 B2pe 14 56495 A3pm 15 60414,5 HR 2902= KQ Pup M2Iabpe+Be 16 62509 HR 2990= 78 beta Gem K0III 17 63351 HR 3215= 15 Cnc= psi Gem A0p 1 18 84367 HR 3871= theta Ant F7V 19 89069 A0p 20 96707 HR 4330 A5p 21 107168 HR 4685= 8 Com A6m 22 108651 HR 4751= 17 Com A4m 23 112185 HR 4905= 77 epsilon UMa A0p V_r 1W_lambda 24 BD+46d1913 Apm 25 137389 HR 5731 A0p 26 147550 HR 6096 B9p 27 148898 HR 6153= 9 Oph A7p 28 151525 HR 6234 45 1 Her A0p 29 176155 HR 7165= FF Aql F5-F9 V_r 1 30 184905 A0p 1 31 189849 HR 7653= 15 Vul Am V_r 32 190073 A0ep 33 192678 A3p 1 34 194093 HR 7796= 37 gamma Cyg F8Ib 35 335238 BD+29d4202 Ap 36 204411 HR 8216 Ap 37 207840 HR 8348 B6Vp 38 208095 HR 8357B A0p V_r 39 216533 A2p 40 220825 HR 8911 = 8 kappa Psc A2p 1 41 221568 V 436 Cas A0 1 42 221760 HR 8949= iota Phe A2p 1 43 223640 HR 9031= 108 iota^3 Aqr A0p 1 -------------------------------------------------------------------------------- References Blanco, C., Catalano, F.A., Godoli, G., Vaccari, S. 1972, Ricerche sulle stelle magnetiche in Giornate di Studio dedicate al Prof. F. Zagar, Milano.