IAU XXVIth General Assembly,

Prague, 2006

 

 

 

N.N. Samus

Moscow, the GCVS team

 

 

 

The draft classification (version August 9, 2006) for new GCVS versions

 

 

Along with the "+" sign (coexistence of two types), it is suggested to introduce the "|" sign (meaning "or") - for classification options for the same object, e.g. EC|Ell, EC|RR.

 

Pulsating variables

 

Present: Suggested:

ACYG ACyg

BCEP, BCEPS BCep (BCEPS, after Jakate, seem not justified)

CEP Cep

DCEP, DCEPS, CEP(B) DCep, DCep0, DCep1, DCepB01, DCepB12

Remark: 0 - fundamental, 1 - 1^st overtone, 01 - fundamental plus overtone, 12 - 1^st and 2^nd overtones. For non-beat Cepheids, it is safer not to indicate the mode yet

CW, CWA, CWB CW (period will also be given)

DSCT, DSCTC, SXPHE DSct (amplitude will also be given, population membership is not always obvious)

L, LB, LC L, Lb (for red stars)

M M

PVTEL PVTel

RR, RRAB, RRC, RR(B) RR, RR0, RR1, RRB01

RV, RVA, RVB RV, RVb (if the secondary wave's amplitude is at least equal to that of the main oscillation)

SR, SRA, SRB, SRC, SRS SR (the regularity level should be indicated by the presentation of the light elements; if a star is a supergiant, it will be obvious from its spectral type)

SRD SRd (we feel not inclined to introduce the UU Her type)

ZZ, ZZA, ZZB, ZZO ZZ (subtype is contained in the spectral type)

BLBOO BLBoo

GDOR GDor

RPHS RPHS (rapidly pulsating hot subdwarfs. We repeat our call for suggestions of a better designation).

LPB or LBV SPB

 

Eruptive variables

 

FU, I, IA, IB, INA, INB, INT, IT, IN(YY), IS, ISA, ISB I, TT, TTc, TTw, HAeBe

Remark: I is for irregulars with doubts about their being young, TTc for classical and TTw, for weak-lined T Tauri stars, HAeBe for Herbig Ae/Be stars

GCAS, BE Be

RCB RCB

RS Move to rotating variables

SDOR SDor

UV, UVN UV

WR WR

New type: PP (a proto-planetary

object)

New type: dL (L dwarf), the causes of variability not quite clear yet

 

Rotating variables

 

ACV, SXARI ACV

ACVO roAp, ACV+roAp

BY BY; also should include chromospherically active giants

ELL Ell

FKCOM FKCom

PSR Psr

R R

RS (earlier among eruptive)

 

Cataclysmic variables and other stars with outbursts

 

No subtype: CV

N, NA, NB N, Nhf (final helium flash; suggestions of a different designation are welcome)

NR Nr, NSym (symbiotic Nova),

UGWZ (see below)

NC NSym

NL CV, UXUMa ("permanent outburst"), VY (VY Scl type, fadings from time to time)

SN, SNI, SNII SN (to avoid introducing the current complex classification)

AM AM (including XM from X-ray variables), DQ (intermediate polars)

UG, UGSS, UGZ UG, UGSS, UGZ

 

UGSU UGSU, UGWZ (WZ Sge type, extremely long supercycles, large amplitudes), UG_ER (ER UMa type, short supercycles and normal cycles, small amplitudes; ideas of a better abbreviation are welcome)

ZAND Sym, NSym

 

 

Eclipsing variables (the description of the class should not mention close binarity)

 

E, EA, EB, EW, EP E, EA, EC - contact

(merging EB and EW), EP

PN, WD, WR Remove from the classification, indicate through the spectral type or Remarks

RS If such a star has eclipses, give notation like EA+RS, RS+EA

AR, D, DM, DS, DW, K, KE, KW, SD Remove from the classification:

as a rule, these types in the GCVS are based on indirect evidence

 

X-ray variables

 

X, XB, XF, XI, XJ, XND, XNG, XP, XPR, XPRM, XM AM (move to cataclysmics), X, XN, XNB (approximately corresponds to XNG, a B star orbiting a compact object), Xlm (low mass), Xhm (high mass), Xmq (microquasars). In this class, advice from experts is especially needed.