The Alpha Persei Cluster, also known as Melotte 20 or Collinder 39, is an open cluster in the constellation of Perseus.To the naked eye, the cluster consists of several blue spectral type B type stars. The most luminous member is the ~2nd magnitude white-yellow supergiant Mirfak, also known as Alpha Persei.Bright members also include Delta, Sigma, Psi, 29, 30, 34 and 48 Persei. I. On the order of 30 new members or likely members associated with X-ray sources have been identified based on available data. [13], Alpha Persei has about 8.5[2] times the Sun's mass and has expanded to roughly 60[6] times the size of the Sun. (or is it just me...), Smithsonian Privacy The 2MASS Ks band magnitude of the 2MASS matching source (from
The present investigation examines possible optical counterparts to 130 X-ray sources in the region of the alpha Persei open cluster (d~170pc, age~50Myr) resulting from the analysis of three 22-25ksec ROSAT PSPC pointings. For almost 60 X-ray sources, an optical counterpart with photometry acceptable for cluster membership is identified, some of which can be excluded from membership on the basis of discrepant radial velocity or X-ray characteristics. Association.". The X-ray source count rate, in counts per second (converted keV energy band, in erg s-1. equinox. Alpha Persei has an apparent visual magnitude of 1.8,[5] and is a circumpolar star when viewed from mid-northern latitudes. arcseconds in the original table.
More recently, Stauffer et al. A match radius of 5 arcseconds was used. from the low mass lithium depletion boundary. al.
A 60-ks observation was obtained on 2000 September 5 using the EPIC MOS and [16], This star, together with γ Persei, δ Persei, η Persei, σ Persei and ψ Persei, has been called the Segment of Perseus. interface to show approximate alpha values for the displayed clusters, where the per-voxel p-value is taken from the interactive threshold slider in the AFNI 'Define Overlay' control panel, and then the per-cluster alpha value is interpolated in this table from 3dClustSim. RA It was described as This weekend, the gibbous moon steals the show, but there's plenty more to see nearby. Jmag angular separation between the X-ray source and the aim point (specified in 1993, A&AS, 98, 477).
In addition to being relatively
Maximum achievable power for cluster designs with 10, 20, 30, 50 or 100 clusters per arm are presented in Figure 1 for standardised effect sizes ranging from 0.05 to 0.30 and for ICCs in the range 0 to 0.1 (which are common ICCs in the medical literature ).
In fact, by the time most of the stars of the Alpha Persei Cluster first formed, including the bright Mirfak, the dinosaurs were already extinct. Consequently, the Chinese name for α Persei itself is 天船三 (Tiān Chuán sān, English: the Third Star of Celestial Boat.)[22]. nnn is the source number. 2003, CDS Catalog II/246). summed MOS and PN detectors, assuming a PN-MOS conversion factor of 3.1. α Persei is the star's Bayer designation. TwoMASS_Dec The most luminous member is the ~2nd magnitude white-yellow supergiant Mirfak, also known as Alpha Persei. The off-axis angle of the X-ray source, in arcminutes, i.e., the
1", AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 11 日, https://en.wikipedia.org/w/index.php?title=Alpha_Persei&oldid=973447468, Articles with Chinese-language sources (zh), Articles containing Chinese-language text, Articles containing explicitly cited English-language text, Creative Commons Attribution-ShareAlike License, This page was last edited on 17 August 2020, at 08:06. The fitted temperature to the X-ray source spectrum, in keV. spectrum, in cm-. The former, meaning 'Elbow' and also written Mirphak, Marfak or Mirzac, comes from the Arabic Mirfaq al-Thurayya, while Algenib, also spelt Algeneb, Elgenab, Gęnib, Chenib or Alchemb, is derived from الجنب al-janb, or الجانب al-jānib, 'the flank' or 'side'. The star also bore the traditional names Mirfak and Algenib, which are Arabic in origin. 2003, CDS Catalog II/246).
Mission Scientist Guaranteed Time (Pallavicini et al., 2004, MmSAI, 75, 434). The Delta Delta Delta and Alpha Delta Pi sorority houses are both located in sorority village at UT.
The X-ray emission measures and luminosities The X-ray emission measures and luminosities have been
The image in this page was obtained by The present investigation examines possible optical counterparts to 130 X-ray sources in the region of the alpha Persei open cluster (d~170pc, age~50Myr) resulting from the analysis of three 22-25ksec ROSAT PSPC pointings. Log_Fx The Galactic Latitude of the Chandra source. Ks_Mag The Alpha Persei (PER-see-EYE) Cluster is an open cluster of hot, bluish-white B-type stars.
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