NSV (S1): New and Suspected Variable Stars (19910714)
FILES:
File #Variables Dec (2000) Zone
nsv_n.s1 4390 Northern sky: +20<=Dec <+90
nsv_e.s1 4165 Equatorial sky: -20< Dec <+20
nsv_s.s1 6256 Southern sky: -90< Dec <=-20
CONTENTS: Catalog of New and Suspected Variable Stars
DATASET: These files come in HyperSky dataset S-8, version 19910714. Availability on HyperSky CD-ROM: Vol. 1 (1993)
DESCRIPTION: These datafiles contain a total of 14811 variable stars from the Catalog of New and Suspected Variable Stars, produced as a companion to the Moscow General Catalog of Variable Stars by B.V. Kukarkin et al. All stars in the NSV have reported but unconfirmed variability. Some NSV stars will eventually prove truly variable; others will be erroneous. In general, all NSV variables should be viewed with caution. The NSV has been split into three declination zone files for this set in the same way as GCVS dataset S-6. No NSV class files have been built since many NSV variables have not been classified at all.
DATA:
Each HyperSky datafile contains the following data from the catalog:
COORDINATES: Equatorial coordinates are stored in the datafiles at equinox 2000, having been precessed from equinox 1950 coordinates in the NSV. No proper motions have been applied, since none were provided in the NSV.
MAG: The variable star maximum magnitude. The type of magnitude is the same as that noted following the magnitude range, discussed below.
IDENTIFICATION: The NSV variable sequence number.
COMMENTS: The comment lines contain the following information, provided if available for each variable. Up to four lines of information may appear for each variable. Each line is discussed separately below:
* A line beginning with "=" giving an alternate star identification. This is usually the name used in the paper announcing the discovery of variability. Identifications have not been retained if they are merely a list number in the discovery paper. Interested users should refer to a printed copy of the NSV for discovery paper references and additional information on alternate identifications.
* Magnitude range and type code, in the general form "MAX-MIN T" where MAX and MIN are numbers and T is the type code letter. MIN may optionally take the form "(MIN", indicating minimum occurs below the given value. MIN will also occasionally take the form "(MIN)", indicating a magnitude range about the maximum magnitude rather than an actual minimum magnitude. A colon following either MIN or MAX indicates uncertainty. The type code letter represents the photometric system in which the magnitudes are reported. Usually the letter will be 'P' (photographic) or 'V' (visual, photovisual, or V of the Johnson and Morgan UBV system). Other upper case letters denote, generally, passbands of the broadband UBVRIJHKL system. See the NSV introduction for more details on these.
* A line beginning with "c=", giving the variable class abbreviation. A brief list is provided here; more complete discussions will be found in the GCVS. If the variable class is uncertain it will be followed by a colon. If the variable belongs to multiple variable classes, the classes are joined by a "+" sign.
ACV = ALPHA2 CVn L = slow
BCEP = BETA Cephei LB = slow red
BL = BL Lacertae M = Mira (long-period)
BY = BY Draconis N = nova
CEP = Cepheid NL = novalike
CST = constant QSO = quasistellar object
CW = W Virginis RCB = R Coronae Borealis
DCEP = DELTA Cephei RR = RR Lyrae
DSCT = DELTA Scuti RRC = RR Lyrae, c subclass
E = eclipsing RV = RV Tauri
EA = Algol (BETA Per) eclipsing S = rapid
EB = BETA Lyrae eclipsing SDOR = S Doradus
ELL = ellipsoidal eclipsing SR = semiregular
GCAS = GAMMA Cassiopeiae SN = supernova
I = irregular UG = U Geminorum
IA = white irregular UV = UV Ceti
IN = irregular in a nebula UVN = UV Ceti in a nebula
INS = rapid irregular in a nebula ZAND = Z Andromedae
INT = T Tauri type irregular ZCAM = Z Camelopardalis
IS = rapid irregular ZZC = ZZ Ceti
* A line beginning with "p=", giving the variable period (if any) in decimal days. The exact meaning of the period depends on the variable type; interested users should consult the NSV for more details. In general, mean cycles are in parentheses, and a colon indicates uncertainty.
* A line beginning with "s=", giving the variable spectral type, in the MK system when available. Detailed notes on spectral types are provided in the NSV introduction. In some cases two spectra will be given separated by a '-', corresponding to spectral classes at MIN-MAX magnitude extremes.
* A line containing the warning "Doubtful" if the star's variability seems doubtful or erroneous to the catalog compilers.