Search Publications
Periodicity of Total Solar Irradiance
Li, K. J.; Xu, J. C.; Gao, P. X. +2 more
We investigate the periodicity in the PMOD composite of the daily total solar irradiance (TSI) from 21 September 1978 to 9 June 2009. Besides the Schwabe cycle period (10.32 years), the quasi-rotation period is found to be statistically significant in TSI, whose value is about 32 days, longer than that in sunspot activity (27 days), and it intermi…
Determination of Fundamental Properties of an M31 Globular Cluster from Main-Sequence Photometry
Fan, Zhou; Zhou, Xu; Ma, Jun +5 more
M31 globular cluster B379 is the first extragalactic cluster whose age was determined by main-sequence photometry. In the main-sequence photometric method, the age of a cluster is obtained by fitting its color-magnitude diagram (CMD) with stellar evolutionary models. However, different stellar evolutionary models use different parameters of stella…
Radiative transfer modeling of near-infrared reflectance of lunar highland and mare soils
Cahill, J. T. S.; Lucey, P. G.; Stockstill-Cahill, K. R. +1 more
With near-infrared hyperspectral data sets returned from KAGUYA/SELENE and Chandrayaan-1's Moon Mineralogic Mapper (M3), accurate evaluation and interpretation of lunar data sets with higher spectral resolution has never been more critical. Here we test a new radiative transfer spectral modeling algorithm to determine composition from h…
Suzaku Observations of the Merging Cluster Abell 85: Temperature Map and Impact Direction
Takata, Tadafumi; Furuzawa, Akihiro; Tamura, Takayuki +2 more
To investigate the present situation of the merging in the southern outer region of Abell 85, we carried out long-time (∼100 ks) observations with Suzaku, and produced an X-ray hardness ratio map. We found a high hardness ratio peak on the east side of a subcluster located south of the cluster; an X-ray spectrum of the region including this peak i…
The XMM-Newton detection of extended emission from the nova remnant of T Pyxidis
Balman, Ş.
We report the detection of an extended X-ray nebulosity with an elongation from north-east to south-west in excess of 15 arcsec in a radial profile and imaging of the recurrent nova T Pyx using the archival data obtained with the X-ray Multi-Mirror Mission (XMM-Newton), European Photon Imaging Camera (pn instrument). The signal-to-noise ratio in t…
RR Lyrae Variables in the Local Group Dwarf Galaxy NGC 147
Yang, S. -C.; Sarajedini, Ata
We investigate the RR Lyrae (RRL) population in NGC 147, a dwarf satellite galaxy of M31 (Andromeda). We used both Thuan-Gunn g-band ground-based photometry from the literature and Hubble Space Telescope Wide Field Planetary Camera 2 archival data in the F555W and F814W passbands to investigate the pulsation properties of RRL variable candidates i…
Herschel observations of deuterated water towards Sgr B2(M)
Menten, K. M.; Martin, P. G.; Murphy, J. A. +53 more
Observations of HDO are an important complement for studies of water, because they give strong constraints on the formation processes - grain surfaces versus energetic process in the gas phase, e.g. in shocks. The HIFI observations of multiple transitions of HDO in Sgr B2(M) presented here allow the determination of the HDO abundance throughout th…
The O I] 1641 Å line as a probe of symbiotic star winds
Shore, S. N.; Wahlgren, G. M.
Aims: The neutral oxygen resonance λ1302 Å line can, if the optical depth is sufficiently high, de-excite by an intercombination transition at λ1641 Å to a metastable state. This has been noted in a number of previous studies but never systematically investigated as a diagnostic of the neutral red giant wind in symbiotic stars and symbiotic-l…
AMDA, Automated Multi-Dataset Analysis: A Web-Based Service Provided by the CDPP
André, N.; Fedorov, A.; Budnik, E. +13 more
We present AMDA (Automated Mutli-Dataset Analysis), a new service recently opened at CDPP. AMDA is a web-based facility for on line analysis of space physics data coming from either its local database or distant ones. This tool allows the user to perform on line classical manipulations such as data visualization, parameter computation or data extr…
Anisotropy of the Taylor scale and the correlation scale in plasma sheet magnetic field fluctuations as a function of auroral electrojet activity
El-Alaoui, M.; Dasso, S.; Matthaeus, W. H. +2 more
Magnetic field data from the Cluster spacecraft in the magnetospheric plasma sheet are employed to determine the correlation scale and the magnetic Taylor microscale from simultaneous multiple-point measurements for multiple intervals over a range of mean magnetic field directions for three different levels of geomagnetic activity. We have determi…