Planetary Nebulae: Observational Properties, Mimics, and Diagnostics
... Abstract: The total number of true, likely and possible planetary nebulae (PN) now known in the Milky Way is nearly 3000, double the number known a decade ago. The new discoveries are a legacy of the recent availability of wide field, narrowband imaging surveys, primarily in the light of H-alpha. In ...
... Abstract: The total number of true, likely and possible planetary nebulae (PN) now known in the Milky Way is nearly 3000, double the number known a decade ago. The new discoveries are a legacy of the recent availability of wide field, narrowband imaging surveys, primarily in the light of H-alpha. In ...
SciPoster_Jan2009
... complex is one of the most prominent areas of star formation for low to intermediate mass stars. Padgett et al. (2008) recently presented Spitzer/MIPS data over a 14.4 square degree map of the entire Ophiuchus molecular cloud, finding more than 300 YSO candidates. Could LDN 425 be part of this “exte ...
... complex is one of the most prominent areas of star formation for low to intermediate mass stars. Padgett et al. (2008) recently presented Spitzer/MIPS data over a 14.4 square degree map of the entire Ophiuchus molecular cloud, finding more than 300 YSO candidates. Could LDN 425 be part of this “exte ...
Unraveling the Helix Nebula: Its Structure and Knots
... from an ionization front (although shock excitation is also possible in some regions, § 4.3). The knots begin to be observed at about the same distance from the central star that the HeII core gives way to the lower ionization H+ +He+ zone that produces the dominant [O III] emission. Throughout this ...
... from an ionization front (although shock excitation is also possible in some regions, § 4.3). The knots begin to be observed at about the same distance from the central star that the HeII core gives way to the lower ionization H+ +He+ zone that produces the dominant [O III] emission. Throughout this ...
The KStars Handbook - KDE Documentation
... INDI State color code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
... INDI State color code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
OBSERVING LUNAR AND ASTEROIDAL OCCULTATIONS: A
... topographic features, then continuously again as the Moon completely passes by. The sequence of events typically lasts from less than one minute to perhaps 2-4 minutes. Predictions of these events are generally quite accurate; the idea is to accurately time each disappearance, blink, dimming, reappe ...
... topographic features, then continuously again as the Moon completely passes by. The sequence of events typically lasts from less than one minute to perhaps 2-4 minutes. Predictions of these events are generally quite accurate; the idea is to accurately time each disappearance, blink, dimming, reappe ...
A search for a new class of pulsating DA white dwarf stars in the DB
... a remarkable and intriguing fact that few helium atmosphere white dwarfs occur in the effective temperature range between 45 000 ≥ T eff ≥ 30, 000 K. The DOs and DBs are found on either side of this temperature range, but only a very few genuine helium atmosphere white dwarfs are found within it (se ...
... a remarkable and intriguing fact that few helium atmosphere white dwarfs occur in the effective temperature range between 45 000 ≥ T eff ≥ 30, 000 K. The DOs and DBs are found on either side of this temperature range, but only a very few genuine helium atmosphere white dwarfs are found within it (se ...
Grade 9 Space Review 50KB Nov 18 2009 10:52:00 AM
... 27. Write a short paragraph describing two essential parts that all telescopes have in common and state the purpose of each part. Use a diagram to illustrate your answer. 28. Not all telescopes use light. Write a short paragraph explaining this statement and provide several examples. 29. Amateur ast ...
... 27. Write a short paragraph describing two essential parts that all telescopes have in common and state the purpose of each part. Use a diagram to illustrate your answer. 28. Not all telescopes use light. Write a short paragraph explaining this statement and provide several examples. 29. Amateur ast ...
Betelgeuse - TeacherWeb
... that makes up Orion’s shoulder in the east. It is 430 light years away from our solar system! It still shines bright in our sky at a magnitude of 0.5. Magnitude being the brightness of a star or celstial being. ...
... that makes up Orion’s shoulder in the east. It is 430 light years away from our solar system! It still shines bright in our sky at a magnitude of 0.5. Magnitude being the brightness of a star or celstial being. ...
Candidate star clusters toward the inner Milky Way discovered on
... We run six different kernel overdensity searches on a sample of ∼266 000 stars from one pawprint from the stacked deep KS -band image. Similar to Piatti et al. (2016) we adopted a cutoff density of 0.05 arcsec−2 , which is a factor of 1.25 higher than the typical background surface density of 0.04 a ...
... We run six different kernel overdensity searches on a sample of ∼266 000 stars from one pawprint from the stacked deep KS -band image. Similar to Piatti et al. (2016) we adopted a cutoff density of 0.05 arcsec−2 , which is a factor of 1.25 higher than the typical background surface density of 0.04 a ...
asteroid wise - Lawrence Hall of Science
... Coordinates For Earth and Sky To roughly locate things in the sky, we can identify groups of stars, called constellations. But to specify exactly where an object is in the sky, we use celestial coordinates. Celestial coordinates are to the sky, as geographical coordinates (latitude and longitude) ar ...
... Coordinates For Earth and Sky To roughly locate things in the sky, we can identify groups of stars, called constellations. But to specify exactly where an object is in the sky, we use celestial coordinates. Celestial coordinates are to the sky, as geographical coordinates (latitude and longitude) ar ...
HR DIAGRAMS OF STAR CLUSTERS
... your cluster HR diagram. Once you have matched the zero-age main-sequence, you can then call up the isochrone-fitting tool. On the menu bar of the ColorMagnitude diagram window, call up Tools > Isochrones, and you will see an isochrone plotted on your HR diagram near the plot of your cluster stars. ...
... your cluster HR diagram. Once you have matched the zero-age main-sequence, you can then call up the isochrone-fitting tool. On the menu bar of the ColorMagnitude diagram window, call up Tools > Isochrones, and you will see an isochrone plotted on your HR diagram near the plot of your cluster stars. ...
PPT presentation
... Contamination of the PN samples The contamination increases with distance to the galaxy. It is negligible for distances < 10 Mpc, as we just saw. At the distance of the Virgo cluster the luminosity function of the contaminants imitates the PNLF of a low-surfacedensity PN population at that distance ...
... Contamination of the PN samples The contamination increases with distance to the galaxy. It is negligible for distances < 10 Mpc, as we just saw. At the distance of the Virgo cluster the luminosity function of the contaminants imitates the PNLF of a low-surfacedensity PN population at that distance ...
Late Summer Messier Objects
... companion Herschel 36 to the WSW, are the primary illuminators of M8, just as star C in the Trapezium is the primary illuminator of M42. Like the Trapezium stars, 9 Sgr and Herschel 36 are O-type stars emitting the great majority of their energy in the ultraviolet spectrum, and causing the hydrogen ...
... companion Herschel 36 to the WSW, are the primary illuminators of M8, just as star C in the Trapezium is the primary illuminator of M42. Like the Trapezium stars, 9 Sgr and Herschel 36 are O-type stars emitting the great majority of their energy in the ultraviolet spectrum, and causing the hydrogen ...
Astrophotography
Astrophotography is a specialized type of photography for recording images of astronomical objects and large areas of the night sky. The first photograph of an astronomical object (the Moon) was taken in 1840, but it was not until the late 19th century that advances in technology allowed for detailed stellar photography. Besides being able to record the details of extended objects such as the Moon, Sun, and planets, astrophotography has the ability to image objects invisible to the human eye such as dim stars, nebulae, and galaxies. This is done by long time exposure since both film and digital cameras can accumulate and sum light photons over these long periods of time. Photography revolutionized the field of professional astronomical research, with long time exposures recording hundreds of thousands of new stars and nebulae that were invisible to the human eye, leading to specialized and ever larger optical telescopes that were essentially big cameras designed to collect light to be recorded on film. Direct astrophotography had an early role in sky surveys and star classification but over time it has given way to more sophisticated equipment and techniques designed for specific fields of scientific research, with film (and later astronomical CCD cameras) becoming just one of many forms of sensor.Astrophotography is a large sub-discipline in amateur astronomy where it is usually used to record aesthetically pleasing images, rather than for scientific research, with a whole range of equipment and techniques dedicated to the activity.