排序方式: 共有3条查询结果,搜索用时 0 毫秒
1
1.
D. Bisht Shashikiran Ganesh R.K.S. Yadav Alok Durgapal Geeta Rangwal 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2018,61(1):571-580
The astrophysical parameters have been estimated for two unstudied open star clusters Teutsch 10 and Teutsch 25 using the Two Micron All Sky Survey () database. Radius is estimated as 4.5 arcmin for both clusters using radial density profiles. We have estimated proper motion values in both RA and DEC directions as and ?mas?yr?1 for Teutsch 10 and and ?mas?yr?1 for Teutsch 25 using 1 catalog. By estimating the stellar membership probabilities, we have identified 30 and 28 most likely members for Teutsch 10 and Teutsch 25 respectively. We have estimated the reddening as ?mag for Teutsch 10 and ?mag for Teutsch 25, while the corresponding distances are and ?kpc. Ages of ?Myr for Teutsch 10 and ?Myr for Teutsch 25 are estimated using the theoretical isochrones of metallicity Z?=?0.019. The mass function slopes are derived as and for Teutsch 10 and Teutsch 25 respectively. Estimated mass function slope for both the clusters are close to the Salpeter value () within the errors. Estimated values of dynamical relaxation time are found to be less than cluster’s age for these objects. This concludes that both objects are dynamically relaxed. The possible reason for relaxation may be due to dynamical evolution or imprint of star formation or both. 相似文献
2.
3.
Alok Taori Navin Parihar 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2011
Coordinated mesospheric night-airglow measurements have been carried out from two stations, Gadanki (13.5° N, 79.2° E) and Allahabad (25.5° N, 81.9° E), India during April 2009 to study the common gravity wave features. With two nights of coordinated measurements we find some of the wave periodicities to be similar at the two locations. Simultaneous OH and O2 intensity measurements over Gadanki reveal these features to be upward propagating gravity waves while the coordinated OH intensity measurements of similar waves from Allahabad show the large spatial extent of these waves. 相似文献
1