HR 6384

Short description: Star in the constellation Ara

HR 6384

250px
The visual band light curve of HR 6384, adapted from Walker et al. (1985)[1]

Observation data
Equinox J2000.0]] (ICRS)
Constellation | Ara[2]
Right ascension |  17h 14m 13.40536s[3]
Declination | −56° 53′ 18.6897″[3]
Apparent magnitude (V) | 6.153[1]
Characteristics
Evolutionary stage | AGB[4]
Spectral type | M1/M2II/III + A[5]
U−B color index | +1.340[1]
B−V color index | +1.787[1]
Variable type | ellipsoidal variable[6]
Astrometry
Radial velocity (Rv)| −34.0±4.0[2] km/s
Proper motion (μ)|  RA: +2.760[3] mas/yr
Dec.: −7.033[3] mas/yr
Parallax (π)| 2.2407 ± 0.1939[3] mas
Distance| 1,500 ± 100 ly
(450 ± 40 pc)
Absolute magnitude (MV)| −2.20[2]
Details
Radius| 160.39+9.31
−23.02[3] R☉
Luminosity| 3,732±368[3] L☉
Temperature| 3,562+287
−99[3] K
Other designations

V829 Ara, CD−56°6744, HD 155341, HIP 84311, HR 6384, SAO 244539[7]

Database references
SIMBAD| data

HR 6384 is a binary star system in the southern constellation of Ara, the Altar. The system is faintly visible to the naked eye with a combined apparent visual magnitude that fluctuates around 6.153,[1] and it is located at a distance of approximately 1,300 light-years (400 parsecs) from the Sun.[3] It is drifting closer with a radial velocity of around −34 km/s.[2]

In 1985, W. S. G. Walker et al. announced that HR 6384 is a variable star, based on three color photometry undertaken at Auckland Observatory in New Zealand.[8] It was given its variable star designation, V829 Arae, in 1987.[9]

The system appears to be a close, interacting binary with a hot secondary component of class A or hotter.[10] It forms a suspected ellipsoidal variable[6] with a period of 80 days and an amplitude variation of 0.08 in magnitude.[11] The primary component is an aging red giant/bright giant with a stellar classification of M1/M2II/III,[5] currently on the asymptotic giant branch.[4] With the supply of hydrogen at its core exhausted, it has expanded to 160 times the girth of the Sun. It is radiating 3,562 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 3,562 K.[3]

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 Walker, W. S. G.; Marino, B. F.; Herdman, G. (August 1985), "Photometry of HR 6384 - an 80 Day Ellipsoidal Binary?", Information Bulletin on Variable Stars 2775: 1, Bibcode: 1985IBVS.2775....1W.
2. ↑ 2.0 2.1 2.2 2.3 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. XHIP record for this object at VizieR.
3. ↑ 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
4. ↑ 4.0 4.1 Eggen, Olin J. (July 1992), "Asymptotic giant branch stars near the sun", Astronomical Journal 104 (1): 275–313, doi:10.1086/116239, Bibcode: 1992AJ....104..275E.
5. ↑ 5.0 5.1 Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode: 1978mcts.book.....H.
6. ↑ 6.0 6.1 Samus, N. N. et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1 61 (1): 80–88, doi:10.1134/S1063772917010085, Bibcode: 2017ARep...61...80S.
7. ↑ "V829 Ara". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=V829+Ara.
8. ↑ Walker, W. S. G.; Marino, B. F.; Herdman, G. (August 1985). "Photometry of HR 6384 - an 80 Day Ellipsoidal Binary?". Information Bulletin on Variable Stars 2775: 1. Bibcode: 1985IBVS.2775....1W. https://articles.adsabs.harvard.edu/pdf/1985IBVS.2775....1W. Retrieved 25 November 2024.
9. ↑ Kholopov, P. N.; Samus, N. N.; Kazarovets, E. V.; Kireeva, N. N. (August 1987). "The 68th Name-List of Variable Stars". Information Bulletin on Variable Stars 3058: 1. Bibcode: 1987IBVS.3058....1K. https://articles.adsabs.harvard.edu/pdf/1987IBVS.3058....1K. Retrieved 25 November 2024.
10. ↑ Ake, T. B.; Parsons, S. B. (March 1985), "HR 6384: a Probable Interacting Binary", Information Bulletin on Variable Stars 2686: 1, Bibcode: 1985IBVS.2686....1A.
11. ↑ Hoffleit, Dorrit (1996), "A Catalogue of Correlations Between Eclipsing Binaries and Other Categories of Double Stars", The Journal of the American Association of Variable Star Observers 24 (2): 105–116, Bibcode: 1996JAVSO..24..105H.

## External links

* HR 6384
* HIP 84311
* Image HD 155341

* v
* t
* e

Ara constellation

Stars
(list)|

| Bayer|

* α (Choo/Tchou)
* β
* γ
* δ
* ε1
* ε2
* ζ (Tseen Yin)
* η
* θ
* ι
* κ
* λ
* μ (Cervantes)
* ν2
* π
* ρ1
* ρ2
* σ

|

Variable|

* R
* S
* RW
* AE
* AT
* BF
* OY
* V535
* V539 (ν1)
* V626
* V750
* V824
* V828
* V829
* V854
* V862
* V872

HR|

* 6167
* 6177
* 6187
* 6188
* 6197
* 6207
* 6215
* 6219
* 6236
* 6251
* 6253
* 6275
* 6297
* 6300
* 6312
* 6320
* 6323
* 6356
* 6368
* 6408
* 6423
* 6438
* 6440
* 6442
* 6447
* 6471
* 6475
* 6477
* 6478
* 6483
* 6487
* 6505
* 6513
* 6525
* 6530
* 6547
* 6572
* 6614
* 6640
* 6759

HD|

* 150897
* 152079
* 152220
* 153201
* 154672
* 154857
* 155951
* 156385
* 156411
* 158907
* 163071
* 164896

Gliese|

* Gliese 674
* Gliese 676

Other|

* 41 G.
* BPM 25114
* CPD -56 8032
* CXOU J164710.2−455216
* GX 339-4
* IRAS 16594-4656
* PSR J1644−4559
* SAO 244567
* SGR 1627-41
* 4U 1636-53
* Westerlund 1-26
* XTE J1650-500
* XTE J1701-462
* 2MASS J18082002−5104378

Star
clusters|

| Association|

* Ara OB1

|

Open|

* IC 4651
* NGC 6193
* NGC 6200
* NGC 6204
* NGC 6208
* NGC 6250
* NGC 6253
* Westerlund 1

Globular|

* ESO 280-SC06
* NGC 6352
* NGC 6362
* NGC 6397

Nebulae|

| Star-forming|

* NGC 6188

|

Planetary|

* IC 4642
* NGC 6326
* Stingray Nebula
* Tc 1

Galaxies|

| NGC|

* 6215
* 6215A
* 6221
* 6300
* 6305
* 6328

|

Other|

* PKS 1718-649

0.00

(0 votes)

Original source: https://en.wikipedia.org/wiki/HR 6384. Read more

|

Retrieved from "https://handwiki.org/wiki/index.php?title=Astronomy:HR_6384&oldid=3940003"
*[RA:]: Right Ascension
*[Dec.:]: Declination
*[v]: View this template
*[t]: Discuss this template
*[e]: Edit this template