Next: Rotation Periods of ZAMS stars Previous: T Tauri Stars . ... The first attempts to directly measure periodic modulation of T Tauri stars occurred in the early 1980s. Rydgren & Vrba (1983) observed four PMS stars using photoelectric photometry over a period of seven consecutive photometric nights. ... Because the spot lifetime is much longer than the rotational period, the observed effect will be a modulation of the light from the star synchronously with the rotation period. ...

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... A1902 Date Received: 2004-Feb-02 18:35:12 Technical Page Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Prop osal Title: ABSTRACT: Regular Astronomy Spectroscopy Extragalactic 50 Hours Rotationally Excited OH Lines in OH Megamaser Galaxies We prop ose to observe a flux-limited sample of OH megamaser galaxies for rotationally excited OH absorption lines at 5 and 6 cm. ... X Part of the observing run. ...

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• http://www.naic.edu/vscience/schedule/tpfiles/HowelltagR2218tp.pdf
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• http://www.naic.edu/vscience/schedule/tpfiles/NolantagR1823tp.pdf

... Version 3.7 - 2002-05-24 GL ----------------------------- Based on v3.4.2 + Converted .par file to XML Version 3.4.2 (2002-05-15) HB ----------------------------- New task parameters added : rawxsyserr,r,h,1.5,,, systematic error of input X-ray positions minxsyserr,r,h,0.2,,, irreducible systematic error of X-ray positions maxsig,r,h,5.0,,, sigma cutoff for X-ray/optical matches usemaxsig,b,h,yes,,, use sigma ... See SSC-SPR-1253, SSC-SPR-1248, SSC-SPR-1129, SSC-SPR-1117. ...

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... CV & PUBLICATIONS | ... Nicholls, DC, Dopita, MA, Sutherland, RS, Jerjen, H, & Kewley, LJ " Metal-poor Dwarf Galaxies in the SIGRID Galaxy Sample. ... Nicholls DC, Jerjen, H, Dopita MA, & Basurah, H. (2014) " Nebular Metallicities in Two Isolated Local Void Dwarf Galaxies ", Astrophysical Journal 780, 88 * . ... Sweet SM, Drinkwater MJ, Meurer G, Bekki K, Dopita MA, Kilborn V, & Nicholls DC, " CHOIRS H I Galaxy Groups: The Metallicity of Dwarf Galaxies" , (2014) Astrophysical Journal , 782, 35 * . ...

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... Tonight's Sky . ... solar system . ... Scientists discover factors to predicting changes in comet rotation . ... Scientists studied comets including 103P/Hartley, shown here, to develop a way to predict rotational changes in comets. ... PSI Senior Scientists Nalin H. Samarasinha and Beatrice E.A. Mueller have determined such changes are a function of a comet s size, period, and the solar energy it receives, but surprisingly not a function of the fraction of a comet s surface that is active. ...

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... My research focusses on spectral line and dust continuum observations of star formation in the Galaxy, particularly using the JCMT. My PhD thesis involved using HARP (the Heterodyne Array Receiver Project, see also my technical pages ), an array spectrograph built in the Cavendish Astrophysics Group for the James Clerk Maxwell Telescope ( JCMT ) for a wide-field survey of star formation. ... For an overview of the survey see Curtis, Richer Buckle (2010) . ... 2010) . ... 2010 Emily Curtis | ...

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... GALAXY: A galaxy is made up of billions or trillions of stars bound together by their own gravity. ... HELIUM (He): The second element in the periodic table, has 2 protons, 2 neutrons, and is a noble gas. ... Helium melts at -272.2 degrees Celsius, and boils at -268.934 degrees Celsius. ... HYDROGEN (H): The first element on the periodic table, is a gas, and has an atomic mass of 1.00794 amu. ... Hydrogen melts at -259.34 degrees Celsius, and freezes at -252.87 degrees Celsius. ...

193. All you need to know about Sunspots | Astronotes

194. Spectroscopic reduction and analysis programs at the DAO

195. Primary mirror support

196. Dark Matter - an Astronomy Net Blackholes2 Forum Message

197. ASP: 2012

198. Meade Instruments Corporation - How Telescopes Work

199. Why is the Moon so high (or so Low)? ? Amateur Astronomers Association of New

200. http://www.winer.org/Downloads/Martini-KOSMOS-arXiv.pdf