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| Query : 2004MNRAS.348.1332M |
2004MNRAS.348.1332M - Mon. Not. R. Astron. Soc., 348, 1332-1336 (2004/March-2)
Evidence of asymmetric structure in the atmosphere of Mira variable U Orionis from lunar occultation observations in the near-infrared.
MONDAL S. and CHANDRASEKHAR T.
Abstract (from CDS):
We present the infrared angular diameter of Mira variable U Ori, obtained from lunar occultation observations at 2.2 µm. The uniform disc (UD) angular diameter is determined to be 11.9±0.3 mas at variability phase 0.28. The source brightness profile derived from a model-independent analysis shows an asymmetric spatial structure. The dispersion in UD angular diameter measurements in comparison with other similar measurements at the same phase in the near-infrared can be explained by a spatial asymmetry of the source, being elongated in the direction northeast - southwest, at position angle of 50°-70°. Several corollary evidences for the spatial asymmetry of the source are presented.
Abstract Copyright: 2004 RAS
Journal keyword(s): occultations - stars: individual: U Ori - infrared: general
Simbad objects: 7
| Number of rows : 7 |
| N | Identifier | Otype |
ICRS (J2000) RA |
ICRS (J2000) DEC |
Mag U | Mag B | Mag V | Mag R | Mag I | Sp type |
#ref
1850 - 2026 |
#notes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | * omi Cet | Mi* | 02 19 20.79210 | -02 58 39.4956 | 7.63 | 6.53 | 5.03 | M5-9IIIe+DA | 1586 | 0 | ||
| 2 | V* R Tri | Mi* | 02 37 02.3403028152 | +34 15 51.341675184 | 8.524 | 7.306 | 8.24 | M3.5-8e | 199 | 0 | ||
| 3 | V* U Ori | Mi* | 05 55 49.1707632432 | +20 10 30.677904084 | 6.82 | 6.39 | 5.40 | 6.24 | M6-9.5e | 500 | 0 | |
| 4 | IRC +10216 | C* | 09 47 57.40632 | +13 16 43.5648 | C9,5e | 2455 | 0 | |||||
| 5 | MR 80 | WR* | 18 02 04.1244400656 | -23 37 42.168277056 | 15.002 | 13.155 | 12.056 | WC9 | 241 | 1 | ||
| 6 | V* S Lac | Mi* | 22 29 00.9084820392 | +40 18 55.856923596 | 10.18 | 7.60 | M4-6.5e | 98 | 0 | |||
| 7 | * 19 Psc | C* | 23 46 23.5164473376 | +03 29 12.519049272 | 10.95 | 7.62 | 5.02 | 3.19 | 1.82 | C-N6 | 462 | 0 |
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