40 Leonis
catalogues and names
| catalogues and names | NSV 04822, 40 Leo, HR 4054, HD 89449, SAO 99065, BD +20 2466 |
| constellation | Leo |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 10h 19min 44.1sec | DEC: +19° 28' 15'' | ||
| position (B1900) | RA: 10h 14min 17.6sec | DEC: +19° 58' 42'' | ||
| proper motion (J2000) | RA: -0.234 arcsec/a | DEC: -0.214 arcsec/a | ||
| radial velocity | 7 km/s note: suspected variable radial velocity |
|||
| rotational velocity | 16 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0.052 arcsec | |||
| galactic coordinates | longitude: 217.12° | latitude: 54.48° | ||
magnitude
| visual magnitude | 4.79 (V on UBV Johnson system) |
spectral / color information
| spectral class | F6IV |
| B-V-magnitude | 0.45 |
| U-B-magnitude | 0.01 |
| R-I-magnitude |
variability information
| variable star identification | 4822 |
| note (category: variability): | Delta Sct?, 4.77 - 4.83V. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 10h 19min 44.155sec | DEC: +19° 28' 15.13'' | ±0.2 arcsec | source: 52 |
| proper motion (J2000) | RA: -0.0166 arcsec/a | DEC: -0.217 arcsec/a | source: 25 | |
| radial velocity | 7 km/s | source: 25 | ||
| trigonometric parallax | 0.052 arcsec | ±0.005 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 217.13° | latitude: 54.48° | ||
magnitude:
| visual | 4.79 (observed) | source: 25 |
| photovisual | 5 | source: 2 |
| photographic | 5 | source: 16 |
spectral information:
| spectral class | F5 | source: 96 | |
| Morgan-Keenan | F6IV | source: 25 | |
| B-magnitude | 5.24 ±0.05 | B-V-magnitude | 0.45 |
| U-magnitude | 5.25 ±0.05 | U-B-magnitude | 0.01 |
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 | |
| 16 | PPM North and PPM South Catalogs and PPM Supplement |
| Roser, S., and U. Bastian, "Catalogue of Positions and Proper Motions," A&AS, Vol. 74, p. 449, 1988, and Bastian, U., et al., "Catalogue of Positions and Proper Motions - South," 1993 | |
| 25 | Bright Star Catalogue, 5th edition |
| Hoffleit, D. and Warren, W.H. Jr., The Bright Star Catalogue, 5th Revised Edition, Version 2, 1994 | |
| 52 | PPMN-HP subset |
| PPMN Star Catalogue (Reference 16) High-Precision Subset (Code H) | |
| 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 (B1950) | RA: 10h 17min 1.009sec | DEC: +19° 43' 31.21'' | ±0.018 arcsec |
| position (J2000) | RA: 10h 19min 44.133sec | DEC: +19° 28' 15.28'' | |
| proper motion B1950 (FK4) | RA: -0.0165 arcsec/a | DEC: -0.22 arcsec/a | ±0.003 arcsec/a in RA ±0.002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0.0166 arcsec/a | DEC: -0.214 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 5 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | F5 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | GC, catalogue number: 14170 |
| Durchmusterung | BD+20 2466 |
| Boss General Catalogue | 14170 |
| Henry Draper Catalogue | 89449 |
data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 10h 17min 1sec | DEC: +19° 43' 31'' |
variability informations:
| variability type | DSCT: | pulsating variable star |
| magnitute at max. brightness | 4.77 | |
| magnitute at min. brightness | 4.83 | |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | F6 |
references
| to a study | 2462D (designation: 40 LEO) |
variability type description
| variability type | description |
| DSCT |
Variables of the Delta Scuti type. These are pulsating variables of spectral types A0-F5 III-V displaying light amplitudes from 0.003 to 0.9 mag in V (usually several hundredths of a magnitude) and periods from 0.01 to 0.2 days. The shapes of the light curves, periods, and amplitudes usually vary greatly. Radial as well as nonradial pulsations are observed. The variability of some members of this type appears sporadically and sometimes completely ceases, this being a consequence of strong amplitude modulation with the lower value of the amplitude not exceeding 0.001 mag in some cases. The maximum of the surface layer expansion does not lag behind the maximum light for more than 0.1 periods. DSCT stars are representatives of the galactic disk (flat component) and are phenomenologically close to the SX Phe variables. DSCTC Low amplitude group of Delta Sct variables (light amplitude <0.1 mag in V). The majority of this type's representatives are stars of luminosity class V; objects of this subtype generally are representative of the Delta Sct variables in open clusters. |