The DBV stars: Progress and problems
... shows the helium layer mass should be about 10-3.5M, in order to explain the “carbon pollution” trace abundances seen in helium rich white dwarfs below 15,000 K. If the Dehner & Kawaler calculations can be extended down to 12,000 K or below, they should be able to show the total helium layer mass of ...
... shows the helium layer mass should be about 10-3.5M, in order to explain the “carbon pollution” trace abundances seen in helium rich white dwarfs below 15,000 K. If the Dehner & Kawaler calculations can be extended down to 12,000 K or below, they should be able to show the total helium layer mass of ...
Rotation Periods and Relative Ages of Solar-Type Stars
... rotation period. To begin, smaller intrinsic spread in Prot is characteristic of older LMS stars, but not young ones. This observation is apparent in Figures 3 and 4. The residuals of Pcalc - Prot are plotted against B - V in Figure 3. A concentration of data points falls on the line Pcalc - Prot = ...
... rotation period. To begin, smaller intrinsic spread in Prot is characteristic of older LMS stars, but not young ones. This observation is apparent in Figures 3 and 4. The residuals of Pcalc - Prot are plotted against B - V in Figure 3. A concentration of data points falls on the line Pcalc - Prot = ...
Ground-Based Astrometry 2010-2020
... planned) achieved first light in 2006. Pan-STARRS plans to survey 30000 square degrees on 0.3′′ pixels to magnitude 24 (single visit). • SkyMapper: Based at Siding Spring Observatory, SkyMapper achieved first light in 2008. During the planned Southern Sky Survey, 20000 square degrees will be imaged ...
... planned) achieved first light in 2006. Pan-STARRS plans to survey 30000 square degrees on 0.3′′ pixels to magnitude 24 (single visit). • SkyMapper: Based at Siding Spring Observatory, SkyMapper achieved first light in 2008. During the planned Southern Sky Survey, 20000 square degrees will be imaged ...
Emergency Land Navigation
... before. Nowadays, all kinds of navigational equipment are available, from the basic compass, map, sextant and almanacs to the highly efficient radars and GPS devices. Although technology brings about convenience and precision, it may not be reliable at all times. Sophiscated equipments often tend to ...
... before. Nowadays, all kinds of navigational equipment are available, from the basic compass, map, sextant and almanacs to the highly efficient radars and GPS devices. Although technology brings about convenience and precision, it may not be reliable at all times. Sophiscated equipments often tend to ...
When we look at a neighboring galaxy (such as M31, the
... The Andromeda Galaxy, also known as M31, is a spiral galaxy physically larger, but less massive, than our Milky Way Galaxy. The Andromeda is the largest member of the Local Group, a cluster of about 30 galaxies that are gravitationally attracted to one another. At a distance of 2.5 million light-yea ...
... The Andromeda Galaxy, also known as M31, is a spiral galaxy physically larger, but less massive, than our Milky Way Galaxy. The Andromeda is the largest member of the Local Group, a cluster of about 30 galaxies that are gravitationally attracted to one another. At a distance of 2.5 million light-yea ...
Lecture 4
... • Warmest observed stars are low-massive; their neutrino luminosity <= 0.01 of modified Urca • Coldest observed stars are more massive; their neutrino luminosity >= 100 of modified Urca ...
... • Warmest observed stars are low-massive; their neutrino luminosity <= 0.01 of modified Urca • Coldest observed stars are more massive; their neutrino luminosity >= 100 of modified Urca ...
November, 2015 - The Baton Rouge Astronomical Society
... Al Rischa (Alpha Psc), Alrescha, Alrisha,”The Cord”, Struve 202, is a close binary star. Alpha Psc A, mag. 4.33, 02 02 02.80 +02 45 49.5; Alpha Psc B, mag. 5.23, 02 02 02.80 +02 45 49.0, are both blue-white main sequence stars with a separation of 1.8 arc-seconds, and an orbital period of 933 years. ...
... Al Rischa (Alpha Psc), Alrescha, Alrisha,”The Cord”, Struve 202, is a close binary star. Alpha Psc A, mag. 4.33, 02 02 02.80 +02 45 49.5; Alpha Psc B, mag. 5.23, 02 02 02.80 +02 45 49.0, are both blue-white main sequence stars with a separation of 1.8 arc-seconds, and an orbital period of 933 years. ...
2 Galaxy morphology and classification
... The dark halo is the dark matter component that envelopes all galaxies. It extends well beyond the visible extents of the galaxy. The ,mass density decreases with radius roughly as where measurable. The nature of the particles that comprise this component is not known, but there is strong evidence t ...
... The dark halo is the dark matter component that envelopes all galaxies. It extends well beyond the visible extents of the galaxy. The ,mass density decreases with radius roughly as where measurable. The nature of the particles that comprise this component is not known, but there is strong evidence t ...
Astronomy Astrophysics First detection of the field star overdensity in the Perseus... &
... the two sets of physical parameters. This cleanest sample contains 8328 stars and is named CS-MB or CS-EC depending on whether their physical parameters were computed using the MB or EC method (see Fig. 1). This sample contains stars with more accurate SPP data, but has fewer statistics owing to the ...
... the two sets of physical parameters. This cleanest sample contains 8328 stars and is named CS-MB or CS-EC depending on whether their physical parameters were computed using the MB or EC method (see Fig. 1). This sample contains stars with more accurate SPP data, but has fewer statistics owing to the ...
19_Testbank - Lick Observatory
... 38) How do we learn about what is going on in the center of our own galaxy (the Milky Way)? A) We have learned it only recently, thanks to the great photographs obtained by the Hubble Space Telescope. B) We cannot see the galactic center with visible or ultraviolet light, but radio and X rays from t ...
... 38) How do we learn about what is going on in the center of our own galaxy (the Milky Way)? A) We have learned it only recently, thanks to the great photographs obtained by the Hubble Space Telescope. B) We cannot see the galactic center with visible or ultraviolet light, but radio and X rays from t ...
ch19
... We are located in the disk of our galaxy and this is why the disk appears as a band of stars across the sky. Early attempts to locate our solar system produced erroneous results. The main problem was that interstellar extinction allows one to only see the nearby stars and makes distant objects appea ...
... We are located in the disk of our galaxy and this is why the disk appears as a band of stars across the sky. Early attempts to locate our solar system produced erroneous results. The main problem was that interstellar extinction allows one to only see the nearby stars and makes distant objects appea ...
IAU-Perraut-2013 - Putting A Stars into Context
... IAU Conference « Putting A Stars into Context” Moscow, 2013 June 3rd ...
... IAU Conference « Putting A Stars into Context” Moscow, 2013 June 3rd ...
Article PDF - IOPscience
... performed with HSTphot (Dolphin 2000), a photometry package specifically designed to handle the undersampled PSF of the WFPC2/HST data. A number of initial pre-processing steps are required before running the photometry procedure. First, image defects such as bad columns and saturated pixels are ide ...
... performed with HSTphot (Dolphin 2000), a photometry package specifically designed to handle the undersampled PSF of the WFPC2/HST data. A number of initial pre-processing steps are required before running the photometry procedure. First, image defects such as bad columns and saturated pixels are ide ...
SRMP Stars Curriculum - American Museum of Natural History
... For this activity, the brighter the light, the better. Hand out one diffraction grating per student. Explain that these act like prisms and break up light into its constituent parts. Turn the dimmable light on low, and turn off the classroom lights. Ask students to view the light through the diffrac ...
... For this activity, the brighter the light, the better. Hand out one diffraction grating per student. Explain that these act like prisms and break up light into its constituent parts. Turn the dimmable light on low, and turn off the classroom lights. Ask students to view the light through the diffrac ...
Cassiopeia (constellation)
Cassiopeia is a constellation in the northern sky, named after the vain queen Cassiopeia in Greek mythology, who boasted about her unrivalled beauty. Cassiopeia was one of the 48 constellations listed by the 2nd-century Greek astronomer Ptolemy, and it remains one of the 88 modern constellations today. It is easily recognizable due to its distinctive 'M' shape when in upper culmination but in higher northern locations when near lower culminations in spring and summer it has a 'W' shape, formed by five bright stars. It is bordered by Andromeda to the south, Perseus to the southeast, and Cepheus to the north. It is opposite the Big Dipper.In northern locations above 34ºN latitude it is visible year-round and in the (sub)tropics it can be seen at its clearest from September to early November in its characteristic 'M' shape. Even in low southern latitudes below 25ºS is can be seen low in the North.