S Mon


The object was found in the following catalogues:
  1. The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

  2. SKY2000 - Master Star Catalog

  3. Smithsonian Astrophysical Observatory Star Catalog

  4. The Washington Visual Double Star Catalog, 1996.0

  5. Combined General Catalogue of Variable Stars (Vol. I-III)


catalogues and names S Mon, 15 Mon, HR 2456, HD 47839, SAO 114258, WDS 06410+0954A
constellation Monoceros

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)


object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

position, motion, parallax:

position (J2000) RA: 6h 40min 58,7sec DEC: +9 53' 44''
position (J1900) RA: 6h 35min 28,2sec DEC: +9 59' 18''
proper motion (J2000) RA: 0,003 arcsec/a DEC: -0,006 arcsec/a
radial velocity 33 km/s
note: spectroscopic binaries
rotational velocity 63 km/s (uncertain) (variable)
trigonometric parallax -0,004 arcsec
note (category: dynamical parallaxes): 0.005".

magnitude

visual magnitude 4,66
(V on UBV Johnson system)

spectral / color information

spectral class O7V((f))
B-V-magnitude -0,25
U-B-magnitude -1,07
R-I-magnitude -0,22
note (category: spectra): Also classified O8III((f)). uv 1240 absorption strong.
note (category: colors): Color excess E(B-V) = +0.07.

variability information

variable star identification S Mon
note (category: variability): ADS 5322A, Ia? 4.62 - 4.67V. R-I also found at -0.11.

double/multiple star system information

number of components of multiple star system 13
separation 2,9 arcsec
mag difference (of double or brightest multiple) 3,5
component ID AB
note (category: double and multiple data): AB binary, 4.8 Oe5, 7.6 B7; C, 9.9v B8V at 17", physical, vsini 141k/s; D, 9.7v A6III at 41", physical, vsini 115k/s; E1 the brighter component of E, B5V at 74", probably optical, vsini 253k/s; E2, A0V, vsini 132k/s.

miscellaneous information

note (category: group membership): In cluster NGC 2264 #131; HII reg. S273; Mon OB1; T-Tauri assoc., Mon T1. The cluster appears to be the nucleus of the association. In region of neutral hydrogen. Ionized Mon OB1 region probably excited by S Mon. The electron density of the HII region increases toward the center of the cluster. (Note that OB associations MonI = IIMon = Mon OB1 and MonII = IMon = OB2. In conversions from the earlier designations to OB1 and OB2 these groups have occasionally been interchanged; however, they may be related.)

data from SKY2000 - Master Star Catalog (Myers+ 1997)

position, motion, parallax:

position (J2000) RA: 6h 40min 58,683sec DEC: +9 53' 44,57'' 0,19 arcsec source: 33
proper motion (J2000) RA: 0,0002 arcsec/a DEC: -0,007 arcsec/a source: 25
radial velocity 33 km/s source: 25
galactic coord. (B1950) longitude: 202,94 latitude: 2,2
GCI unit vector (J2000) X: -0,175203 Y: 0,969417 Z: 0,171855

magnitude:

visual 4,6 (observed) source: 31
photovisual 4,7 source: 2

spectral information:

spectral class O0 source: 96
Morgan-Keenan O7V((f)) source: 25
B-magnitude 4,41 0,05 B-V-magnitude -0,25
U-magnitude 3,34 0,05 U-B-magnitude -1,07

variability information:

source of data: 30
variability type 200
var. amplitude 0,06

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 0 arcsec
position angle 36

sources:

2 HD and HDE Catalogs
Cannon, A.J., and E.C. Pickering, Harvard Annals, Vols 91-99, 1918-24, Cambridge, Massachusetts: Harvard University; Cannon, A.J., Harvard Annals, Vol. 100, 1925-36, Cambridge, Massachusetts: Harvard University; and Cannon, A.J., and M. Walton Mayall, Harvard Annals, Vol. 112, 1949, Cambridge, Massachusetts: Harvard University
19 WDS Catalog
Worley, C.E., and G.G. Douglass, Washington Catalog of Visual Double Stars 1996.0, United States Naval Observatory, 1996
25 Bright Star Catalogue, 5th edition
Hoffleit, D. and Warren, W.H. Jr., The Bright Star Catalogue, 5th Revised Edition, Version 2, 1994
30 GCVS, 4th edition
Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88
31 CRM' (non-GCVS variable data)
Warren, W.H. Jr., Northern Hemisphere Catalog of Red Magnitudes, 1994
33 Hipparcos Main Input Catalogue Version 2
Turon, C., et al., The Hipparcos Input Catalogue, Version 2, CDS Bull. No. 43, p.5, 1993
96 SAO or HD/HDE Catalog
Reference from Value 1 or Reference from Value 2

data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)

position and proper motion:

position (J1950) RA: 6h 38min 13,429sec DEC: +9 56' 37,02'' 0,01 arcsec
position (J2000) RA: 6h 40min 58,688sec DEC: +9 53' 44,41''
proper motion J1950 (FK4) RA: 0,0001 arcsec/a DEC: -0,007 arcsec/a 0,002 arcsec/a in RA
0,002 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0002 arcsec/a DEC: -0,006 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 4,7 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class Oe5
source of spectral data Taken from the HD with M stars reclassified by Miss Cannon.

catalogues

source catalogue FK3, catalogue number: 253
Durchmusterung BD+10 1220
Boss General Catalogue 8720
Henry Draper Catalogue 47839

data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)

position and proper motion:

position (J2000) RA: 6h 41min DEC: +9 54'
proper motion (J2000) RA: -0,021 arcsec/a DEC: -0,003 arcsec/a

double/multiple star system information:

component year number of measures position angle angular separation magnitude of 1st component magnitude of 2nd component spectral class(es) discoverer code
AB 1869 14 45 3,8'' 9,3 10,4 B6V D 11
AC 1873 5 222 40,8'' 9,3 9,7 - D 11
Aa 1988 2 13 0,1'' 4,66 - O7Ve CHR 168
1993 36 0''
Aa-B 1825 54 209 2,8'' 4,8 7,6 - STF 950
1983 213 2,9''
Aa-C 1831 24 13 16,6'' 4,7 9,9 - STF 950
Aa-D 1841 4 308 41,3'' 4,7 9,7 - STF 950
Aa-E 1874 12 139 73,9'' 4,7 10 - STF 950
Aa-F 1874 4 222 155,9'' 4,8 9,08 - STF 950
Aa-K 1923 1 56 105,6'' 4,7 8,2 - STF 950
Aa-S 1914 1 261 136,6'' 4,7 9,7 - STF 950
FG 1873 4 262 39,8'' 7,8 8,3 - STF 950
FS 1914 1 342 98,5'' 7,8 9,8 - STF 950
GS 1914 1 5 98,3'' 8,3 9,8 - STF 950
- 1914 3 166 89,5'' 4,8 8 - STF 950
- 1874 3 103 178,3'' 4,7 9,4 - STF 950
- 1902 1 115 14,2'' - - - STF 950

discoverer information:

discoverer code discoverer reference
D 11 Dembowski, E. -
CHR 168 - -
STF 950 Struve, F.G.W. -

notes:

note A is an irregular variable, S Mon. A measure of STF 950 A and D 11 C. A measure of STF 950 A and STF 952 A. E is BD+10@1223. F is BD+09@1338. Proper motion of F -002 -001.

data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)

position:

position (J1950) RA: 6h 38min 13,4sec DEC: +9 56' 37''

variability informations:

variability type IA: eruptive variable star
magnitute at max. brightness 4,62
magnitute at min. brightness 4,68
photometric system visual, photovisual or Johnson's V

spectral information

spectral class O7.5III-Vf

references

to a chart/photograph Vol. I GCVS (see Kholopov et al. 1985-1988)

miscanellous

ID in the GCVS catalogue 55/2
constellation Monoceros
notes on existence The star is equivalent to '0550003 T'.
There are notes in published catalog.

variability type description

variability type description
IA Poorly studied irregular variables of early (O-A) spectral type.