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Дата изменения: Mon Sep 4 18:06:16 2006 Дата индексирования: Sat Dec 22 07:49:03 2007 Кодировка: Windows-1251 Поисковые слова: heart nebula |
IAU XXVIth General Assembly,
N.N. Samus
The draft classification (version
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 - 1st overtone, 01 - fundamental plus overtone, 12 - 1st
and 2nd 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.