SU Aurigae

Last updated
SU Aurigae
Suaur.jpg
Diagram of SU Aurigae's magnetic field
Observation data
Epoch J2000        Equinox J2000
Constellation Auriga
Right ascension 04h 55m 59.38527s [1]
Declination +30° 34 01.5190 [1]
Apparent magnitude  (V)9.30 [2]
Characteristics
Spectral type G2IIIne [2]
B−V color index +0.74 [3]
Variable type T Tauri
Astrometry
Radial velocity (Rv)23.20 [4]  km/s
Proper motion (μ)RA: 1.18 [1]   mas/yr
Dec.: -22.24 [1]   mas/yr
Parallax (π)6.85 ± 2.23  mas [1]
Distance approx. 500  ly
(approx. 150  pc)
Absolute magnitude  (MV)+2.83 [3]
Details [3]
Mass 2.0±0.1  M
Radius 2.61+0.20
−0.23
  R
Luminosity 6.3±1.6  L
Surface gravity (log g)3.91+0.07
−0.10
  cgs
Temperature 5550±100  K
Rotation 1.76+0.29
−0.33
Rotational velocity (v sin i)66.2 km/s
Age 4  Myr
Other designations
SU Aur, BD+30° 743, HD 282624, HIP 22925, SAO 57509
Database references
SIMBAD data

SU Aurigae is a T Tauri-type variable star in the constellation Auriga. It is located about 500 light-years (150 parsecs) away in the Taurus-Auriga Star Forming Region. Its apparent magnitude is 9.30, which is dim enough that it cannot be seen with the unaided eye.

SU Aurigae's spectral type of G2IIIne means that it is a G-type star with an effective temperature similar to the Sun. The III in the spectral type refers to its luminosity, which is much higher than normal G-type main sequence stars and would put it in the giant star class. [5] However, it is only about 4 million years old, which is relatively young for a star - young protostars like SU Aurigae are luminous because they are larger, not condensing into a normal size until they are older. [6]

Light curves for SU Aurigae. The main plot shows the long term variability, and the inset plot shows the short term variability measured by the MOST spacecraft. Adapted from Grankin et al. (2018) and Cody et al. (2013) SUAurLightCurve.png
Light curves for SU Aurigae. The main plot shows the long term variability, and the inset plot shows the short term variability measured by the MOST spacecraft. Adapted from Grankin et al. (2018) and Cody et al. (2013)

SU Aurigae is known to have a circumstellar protoplanetary disk surrounding it, which is typical of many T Tauri stars. [6] SU Aurigae's disk has a high inclination of 62° and is nearly perpendicular to the plane of sky, so orbiting protoplanets or comets may be the cause of why there are drops in the amount of light detected. [3] SU Aurigae's proper motion and distance is similar to AB Aurigae, [1] a better known pre-main-sequence star, meaning that the two may form a very wide binary system; [5] if not, they are still in the same star association.

Related Research Articles

<span class="mw-page-title-main">Telescopium Herschelii</span> Former constellation

Telescopium Herschelii, also formerly known as Tubus Hershelli Major, is a former constellation in the northern celestial hemisphere. Maximilian Hell established it in 1789 to honour Sir William Herschel's discovery of the planet Uranus. It fell out of use by the end of the 19th century. Psi2 Aurigae at apparent magnitude 4.8 was the constellation's brightest star.

<span class="mw-page-title-main">Iota Aurigae</span> K-type star in the constellation Auriga

Iota Aurigae, officially named Hassaleh, is a star in the northern constellation of Auriga. It has an apparent visual magnitude of 2.7, which is bright enough to be readily visible to the naked eye. Parallax measurements give a distance estimate of roughly 490 light-years from the Sun.

<span class="mw-page-title-main">Pi Aurigae</span> Star in the constellation Auriga

Pi Aurigae, Latinized from π Aurigae, is the Bayer designation for a single, red-hued star in the northern constellation of Auriga. Located about one degree north of the 2nd magnitude star Beta Aurigae, Pi Aurigae is visible to the naked eye with an apparent visual magnitude of 4.25 Based upon parallax measurements, it is approximately 780 light-years away from Earth. At that distance, the brightness of the star is diminished by 0.54 in magnitude from extinction caused by interstellar gas and dust.

<span class="mw-page-title-main">Upsilon Aurigae</span> Star in the constellation Auriga

Upsilon Aurigae, Latinised from υ Aurigae, is the Bayer designation for a single star in the northern constellation of Auriga. It has an apparent visual magnitude of 4.74, which means it is bright enough to be seen with the naked eye. Based upon parallax measurements, this star is approximately 500 light-years distant from the Earth. It is drifting further away with a radial velocity of +38 km/s.

<span class="mw-page-title-main">Mu Aurigae</span> Star in the constellation Auriga

Mu Aurigae, Latinized as μ Aurigae, is the Bayer designation for an unconfirmed binary star in the northern constellation of Auriga. It is visible to the naked eye with an apparent visual magnitude of +4.88. Based upon an annual parallax shift of 20.7218±0.4971 mas as seen from Earth, is located 157 light-years from the Sun.

<span class="mw-page-title-main">19 Aurigae</span> Star in the constellation Auriga

19 Aurigae is a single star located approximately 3,800 light years away from the Sun in the northern constellation Auriga. It is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 5.05. The star is moving closer to the Earth with a heliocentric radial velocity of 4.3 km/s.

<span class="mw-page-title-main">UU Aurigae</span> Star in the constellation of Auriga

UU Aurigae is a carbon star in the constellation Auriga. It is approximately 341 parsecs from Earth.

5 Aurigae is a triple star system in the northern constellation of Auriga, located about 195 light years away from the Sun based on parallax. It is just visible to the naked eye as a dim, yellow-white hued star with an apparent visual magnitude of 5.95. The system is moving away from the Earth with a heliocentric radial velocity of +6 km/s, having come within 62.4 light-years some 8.7 million years ago.

<span class="mw-page-title-main">59 Aurigae</span> Star in the constellation Auriga

59 Aurigae, often abbreviated as 59 Aur, is a star in the constellation Auriga. Its baseline apparent magnitude is 6.1, meaning it can just barely be seen with the naked eye as a dim, yellow-white hued star. Based on parallax measurements, it is located about 483 light-years away from the Sun.

<span class="mw-page-title-main">AR Aurigae</span> Binary star system in the constellation Auriga

AR Aurigae, also known by its Flamsteed designation 17 Aurigae, is a binary star in the constellation Auriga. Based on parallax measurements made by the Hipparcos spacecraft, it is approximately 461 light-years from Earth.

Psi<sup>4</sup> Aurigae Star in the constellation Auriga

Psi4 Aurigae, Latinized from ψ4 Aurigae, is a single, orange-hued star in the northern constellation of Auriga. It is visible to the naked eye with an apparent visual magnitude of +5.02. With an annual parallax shift of 10.08 ± 0.33 mas, it is approximately 324 light-years distant from Earth.

Psi<sup>9</sup> Aurigae Star in the constellation Auriga

Psi9 Aurigae, Latinised from ψ9 Aurigae, is a star in the northern constellation of Auriga. It is dimly visible to the naked eye with an apparent visual magnitude of 5.75. Based upon an annual parallax shift of 2.59 mas, the distance to this star is approximately 1,300 light-years.

<span class="mw-page-title-main">16 Lyncis</span> Star in the constellation Lynx

16 Lyncis is a star in the constellation Lynx. It is positioned next to the western constellation border with Auriga, and is also known as Psi10 Aurigae, which is Latinized from ψ10 Auriga. The star has a white hue and is visible to the naked eye with an apparent visual magnitude of 4.90. The distance to this object is approximately 241 light-years based on parallax, but it is drifting closer to the Sun with a radial velocity of −12 km/s. It has an absolute magnitude of 0.56.

<span class="mw-page-title-main">IQ Aurigae</span> Star in the constellation Auriga

IQ Aurigae is a single, variable star in the northern constellation of Auriga. It is visible to the naked eye as a dim, white-hued star with an apparent visual magnitude that fluctuates around 5.38. The star is located at a distance of about 460 light-years from the Sun based on parallax and is drifting further away with a radial velocity of +28.6 km/s.

<span class="mw-page-title-main">HD 34626</span> Star in the constellation Auriga

HD 34626, also known as MZ Aurigae, is an unusual variable star in the northern constellation of Auriga. It has an apparent magnitude of 8.2 and is about 3,300 light years away.

<span class="mw-page-title-main">V433 Aurigae</span> Star in the constellation Auriga

V433 Aurigae is a variable star in the constellation Auriga. It is a slowly pulsating B star (SPB) that ranges from apparent magnitude 6.02 to 6.06 over 4.6 days. Using a Hipparcos-derived distance of about 1,060 light-years (324 pc), it shines with a luminosity approximately 322 times that of the Sun and has a surface temperature of 7400 K. However, measurements by Gaia indicate a much higher distance of 3,200 light-years (980 pc).

<span class="mw-page-title-main">AB Aurigae</span> Star in the constellation Auriga

AB Aurigae is a young Herbig Ae star in the Auriga constellation. It is located at a distance of approximately 531 light years from the Sun based on stellar parallax. This pre-main-sequence star has a stellar classification of A0Ve, matching an A-type main-sequence star with emission lines in the spectrum. It has 2.4 times the mass of the Sun and is radiating 38 times the Sun's luminosity from its photosphere at an effective temperature of 9,772 K. The radio emission from the system suggests the presence of a thermal jet originating from the star with a velocity of 300 km s−1. This is causing an estimated mass loss of 1.7×10−8 M yr−1.

<span class="mw-page-title-main">13 Monocerotis</span> Star in the constellation Monoceros

13 Monocerotis is a class A0 Ib star in the constellation Monoceros. Its apparent magnitude is 4.5 and it is approximately 780 parsecs (2,500 ly) away.

5 Serpentis is a wide binary star system in Serpens Caput, the western section of the equatorial constellation of Serpens. It is faintly visible to the naked eye with an apparent visual magnitude of 5.10. Based upon an annual parallax shift of 39.40±0.29 mas as viewed from Earth's orbit, it is located 83 light years away. The brighter member is an IAU radial velocity standard star, and it is moving away from the Sun with a heliocentric radial velocity of +54.3 km/s. The system made its closest approach to the Sun about 153,000 years ago at a separation of 68 ly (20.7 pc).

<span class="mw-page-title-main">RW Aurigae</span> Young binary star system in the constellation Auriga

RW Aurigae is a young binary system in the constellation of Auriga about 530 light years away, belonging to the Taurus-Auriga association of the Taurus Molecular Cloud. RW Aurigae B was discovered in 1944.

References

  1. 1 2 3 4 5 6 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv: 0708.1752 . Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID   18759600.
  2. 1 2 "SU Aur". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 17 January 2016.
  3. 1 2 3 4 DeWarf, L. E.; Sepinsky, J. F.; Guinan, E. F.; Ribas, I.; Nadalin, I. (2003). "Intrinsic Properties of the Young Stellar Object SU Aurigae". The Astrophysical Journal. 590 (1): 357–367. Bibcode:2003ApJ...590..357D. CiteSeerX   10.1.1.508.2455 . doi:10.1086/374979. S2CID   122600915.
  4. Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv: 1606.08053 . Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID   119231169.
  5. 1 2 "AB Aurigae - Jim Kaler". 4 January 2013. Retrieved 17 January 2017.
  6. 1 2 "Encyclopedia of Science: T Tauri star". Archived from the original on 27 January 2021. Retrieved 17 January 2017.
  7. Grankin, K. N.; Shenavrin, V. I.; Irsmambetova, T. R.; Petrov, P. P. (September 2018). "SU Aur: A deep fading event in Visible and near-infrared bands". Information Bulletin on Variable Stars. 6253 (1): 1. arXiv: 1809.04466 . Bibcode:2018IBVS.6253....1G. doi: 10.22444/IBVS.6253 .
  8. Cody, Ann Marie; Tayar, Jamie; Hillenbrand, Lynne A.; Matthews, Jaymie M.; Kallinger, Thomas (March 2013). "Precise High-cadence Time Series Observations of Five Variable Young Stars in Auriga with MOST". The Astronomical Journal. 145 (3): 79. arXiv: 1302.0018 . Bibcode:2013AJ....145...79C. doi:10.1088/0004-6256/145/3/79. S2CID   1261183 . Retrieved 1 November 2021.