Archive for dark nebulae

Young stars and dusty nebulae in Taurus

Posted in astronomy with tags , , on April 22, 2017 by Tim Kendall

Image and text credit: APOD: Lloyd L. Smith, Deep Sky West. This complex of dusty nebulae lingers along the edge of the Taurus molecular cloud, a mere 450 light-years distant. Stars are forming on the cosmic scene. Composed from almost 40 hours of image data, the 2 degree wide telescopic field of view includes some youthful T-Tauri class stars embedded in the remnants of their natal clouds at the top. Millions of years old and still going through stellar adolescence, the stars are variable in brightness and in the late phases of their gravitational collapse. Their core temperatures will rise to sustain nuclear fusion as they grow into stable, low mass, main sequence stars, a stage of stellar evolution achieved by our middle-aged Sun about 4.5 billion years ago. Another youthful variable star, V1023 Tauri, can be spotted in the lower part of the image. Within its yellowish dust cloud, it lies next to the striking blue reflection nebula Cederblad 30, also known as LBN 782. Above the bright bluish reflection nebula is dusty dark nebula Barnard 7.

Dark nebulae: multiwavelength imaging of Barnard 68

Posted in astronomy with tags , on December 14, 2014 by Tim Kendall

Image credit: Emil Ivanov. The field shows the Snake Nebula, Barnard 72, together with B68, B69, B70 and B74. These nebulae were catalogued first by the American E.E. Barnard in the early years of the last century.

eso9934bImage credit: ESO/SOFI

Barnard 68 is a dark cloud situated at a distance of about 500 light-years (160 pc) towards the southern constellation Ophiuchus (The Serpent-holder). This image represents the sky area of the so-called Bok globule Barnard 68 – nicknamed the Dark Cloud – imaged in six different wavebands, clockwise from the blue to the near-infrared spectral region. Three of these frames (“blue” B-band at wavelength 440 nm = 0.44 µm; “green-yellow” V-band at 0.55 µm; near-infrared I-band at 0.90 µm) were obtained with the FORS1 instrument at the VLT ANTU telescope and three with SOFI at the NTT through near-infrared filters (J-band at 1.25 µm; H-band at 1.65 µm; Ks-band at 2.16 µm). It is evident that the obscuration caused by the cloud diminishes dramatically with increasing wavelength. Since the outer regions of the cloud are less dense than the inner ones, the apparent size of the cloud also decreases, as more background stars shine through the outer parts. Each frame covers an area of 4.9 x 4.9 arcmin². North is up and East is left.

Dark “doodad” nebula and globular cluster NGC 4372

Posted in astronomy with tags on December 24, 2013 by Tim Kendall

Located in the southern constellation of Musca, the Fly, this dark nebula spans nearly three degrees on the sky and is one of the finest examples of its kind. The original image credit (© Ivan Eder 2012) is here and the nebula has its own Wikipedia entry here.