K Puppis

Short description: Star in the constellation Puppis

k Puppis

Location of k Puppis (circled)

Observation data
{{#ifeq:J2000.0|J2000.0 (ICRS)|Epoch J2000.0 Equinox J2000.0 (ICRS)| [[History:Epoch|Epoch J2000.0]] [[Astronomy:Equinox (celestial coordinates)|Equinox J2000.0}}
Constellation | Puppis
k1 Pup
Right ascension |  07h 38m 49.380s[1]
Declination | −26° 48′ 06.49″[1]
Apparent magnitude (V) | +4.50[2]
k2 Pup
Right ascension |  07h 38m 49.869s[1]
Declination | −26° 48′ 13.80″[1]
Apparent magnitude (V) | +4.429[1]
Characteristics

Spectral type | B6 V[3]

Spectral type | B5 IV[3]
Variable type | SX Ari[4]
Astrometry
Parallax (π)| 9.41 ± 0.80[5] mas
Distance| 350 ± 30 ly
(106 ± 9 pc)

Absolute magnitude (MV)| −1.19[6]

Absolute magnitude (MV)| −0.94[6]
Details[6]

Mass| 4.3±0.3 M☉
Radius| 3.7+1.2
−0.6 R☉
Luminosity| 490 L☉
Surface gravity (log g)| 4.24±0.15 cgs
Temperature| 13,600±1,200 K
Rotational velocity (v sin i)| 114±5 km/s

Mass| 6.0±0.3 M☉
Radius| 3.0+0.7
−0.3 R☉
Luminosity| 1,202 L☉
Surface gravity (log g)| 4.10±0.15 cgs
Temperature| 18,500±500 K
Rotational velocity (v sin i)| 61±5 km/s
Other designations

HIP 37229, CD−26 4707, NSV 3673

k1: HR 2948, HD 61555, SAO 174198
k2: HR 2949, HD 61556, SAO 174199
Database references
SIMBAD| k Puppis
| k1
| k2

k Puppis (k Pup, k Puppis) is a Bayer designation given to an optical double star in the constellation Puppis, the two components being k1 Puppis and k2 Puppis.

## Contents

* 1 Bayer designation
* 2 Description
* 3 References
* 4 External links

## Bayer designation

Note that the Bayer designation for this star is "k" not "kappa" (κ). In Bayer's original Uranometria, k Puppis was listed as ρ (rho) Navis.[7] When Lacaille broke apart the large constellation Argo Navis into Carina, Puppis, and Vela, he re-designated the stars with Greek letters in a single sequence across all three constellations. Additionally, Lacaille used Latin letters for many additional stars. κ (kappa) is in the constellation of Vela and so there is no kappa in Puppis.[8] The confusion also extends to the proper name Markab which properly applies to κ Velorum (and other stars) but which has also been used for k Puppis when it is called κ Puppis.[9]

## Description

File:K2PupLightCurve.pngA light curve for k2 Puppis, plotted from TESS data[10]

Both k1 Puppis and k2 Puppis are bright blue B-type stars of nearly equal brightness, +4.50 and +4.62, respectively. To the naked eye, the pair has a combined magnitude of +3.80. On the sky, the two stars are separated by approximately 9.9 seconds of arc along PA 318°. The optical pair can be distinguished easily with a small telescope. The component k1 Puppis is a binary star system in its own right, while k2 Puppis is a variable star. Each star within the k Puppis optical pair is between 450 and 470 light years from Earth.

k Puppis is listed in the General Catalogue of Variable Stars as a suspected variable star, but the range and type are not stated. The International Bulletin of Variable Stars has since published research showing that k2 Puppis is the variable component. It is an SX Arietis variable with a period of 1.9093 days which is also the rotational period of the star. The total amplitude is 0.015 apparent magnitude.[4]

k2 Puppis is a chemically peculiar star with a strong magnetic field. It is classified as a He-weak star and in addition to a deficit of helium in its spectrum, it shows an overabundance of many iron peak and rare earth elements. All of its spectral lines show variability, probably due to variations in the chemical makeup of its atmosphere as it rotates.[6]

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 Høg, E. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. Bibcode: 2000A&A...355L..27H.
2. ↑ Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues 2237. Bibcode: 2002yCat.2237....0D.
3. ↑ 3.0 3.1 Houk, N (1982). "Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Volume_3. Declinations -40_ƒ0 to -26_ƒ0". Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Volume_3. Declinations -40_ƒ0 to -26_ƒ0. Bibcode: 1982mcts.book.....H.
4. ↑ 4.0 4.1 Rivinius, Th; Stahl, O; Baade, D; Kaufer, A (2003). "A New Bright Helium Variable B Star: HR 2949". Information Bulletin on Variable Stars 5397: 1. Bibcode: 2003IBVS.5397....1R.
5. ↑ Van Leeuwen, F (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V.
6. ↑ 6.0 6.1 6.2 6.3 Shultz, M; Rivinius, Th; Folsom, C. P; Wade, G. A; Townsend, R. H. D; Sikora, J; Grunhut, J; Stahl, O et al. (2015). "The magnetic field and spectral variability of the He-weak star HR 2949". Monthly Notices of the Royal Astronomical Society 449 (4): 3945. doi:10.1093/mnras/stv564. Bibcode: 2015MNRAS.449.3945S.
7. ↑ "Linda Hall Library Bayer, Johann, Explicatio...Uranometrias". http://stars.lindahall.org/bayb.htm.
8. ↑ Ian Ridpath. "Argo Navis". http://www.ianridpath.com/startales/argo.htm.
9. ↑ Kostjuk, N. D. (2004). "VizieR Online Data Catalog: HD-DM-GC-HR-HIP-Bayer-Flamsteed Cross Index (Kostjuk, 2002)". VizieR On-line Data Catalog: IV/27A. Originally Published in: Institute of Astronomy of Russian Academy of Sciences (2002) 4027. Bibcode: 2004yCat.4027....0K.
10. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html.

## External links

* Puppis

* v
* t
* e

Stars of Puppis

Bayer|

* ζ (Naos)
* ν
* ξ (Azmidi)
* ο
* π
* ρ (Tureis)
* σ
* τ
* χ
* L2

Flamsteed|

* 1
* 2
* 3 (l)
* 4
* 5
* 6
* 8
* 9
* 10
* 11 (j)
* 12
* 14
* 16
* 18
* 19
* 20
* 21
* 22

Variable|

* R
* T (not variable)
* V
* Z
* RS
* RX
* ST
* TY
* UY
* UZ
* VV
* VX
* VZ
* WW
* AQ
* AR
* AU
* BB
* BN
* BV
* CP
* HH
* HZ
* KQ
* MX (r)
* MY (y3)
* MZ
* NO
* NP
* NS (h1)
* NV (υ1)
* NW (υ2)
* NX
* OU (L1)
* OS
* OW (z)
* OX
* PQ
* PR
* PT
* PU (m)
* PV
* PX
* PY
* QS
* QU
* QW (I)
* QY
* QZ (b)
* V336
* V338
* V339
* V347
* V348
* V351
* V363
* V368
* V376
* V378
* V390
* V392
* V397
* V420
* V436
* V438
* V443
* V445
* V468 (d4)
* V510
* V574
* V575
* V596
* V597
* V598

HR|

* 2157
* 2158
* 2178
* 2187
* 2204
* 2211
* 2348 (G)
* 2384
* 2462 (V)
* 2475
* 2482
* 2488
* 2518 (x)
* 2548 (X)
* 2549
* 2558
* 2563
* 2579
* 2594
* 2604
* 2608
* 2612
* 2619 (t)
* 2626
* 2641
* 2658
* 2666 (C)
* 2667
* 2672 (H)
* 2677
* 2685
* 2687
* 2691 (D)
* 2702 (A)
* 2719
* 2727 (E)
* 2759
* 2762
* 2769
* 2770
* 2771
* 2789 (M)
* 2791 (F)
* 2794
* 2829
* 2856
* 2860
* 2863
* 2868
* 2870
* 2873
* 2874
* 2875 (y)
* 2881
* 2895
* 2897
* 2899
* 2900
* 2906
* 2909 (n)
* 2910 (n)
* 2913
* 2916
* 2922 (p)
* 2923
* 2933
* 2937 (f)
* 2940 (y2)
* 2945
* 2948 (k1)
* 2949 (k2)
* 2954 (e)
* 2955
* 2956
* 2959
* 2960
* 2961 (d1)
* 2963 (d2)
* 2964 (d3)
* 2976
* 2981
* 2984
* 2988
* 2994
* 2998
* 3001
* 3002 (W)
* 3007
* 3011
* 3017 (c)
* 3018
* 3019
* 3020
* 3023
* 3027
* 3035
* 3037
* 3042
* 3043
* 3046 (Q)
* 3051
* 3052
* 3055 (P)
* 3057
* 3060
* 3068
* 3069
* 3071
* 3074
* 3079
* 3080 (a)
* 3085
* 3089
* 3090 (J)
* 3091
* 3092
* 3096
* 3101
* 3111
* 3114
* 3116 (N)
* 3118
* 3121 (O)
* 3131
* 3137
* 3140
* 3142
* 3143
* 3148
* 3154
* 3155
* 3160
* 3166
* 3177
* 3183
* 3190
* 3194
* 3199
* 3205
* 3219
* 3226
* 3233
* 3238
* 3239
* 3241
* 3242
* 3243 (h2)
* 3251
* 3253
* 3259
* 3261
* 3266
* 3270 (q)
* 3273
* 3276
* 3279
* 3281
* 3282 (w)
* 3283
* 3286
* 3291
* 3308
* 3315
* 3316
* 3317
* 3320
* 3324
* 3326

HD|

* 44594
* 48265 (Nosaxa)
* 49798
* 50499
* 53680
* 53706
* 59235
* 61005
* 61589
* 61750
* 62542
* 63291
* 63399
* 63696
* 63734
* 65638
* 66885
* 67408
* 69904
* 70642

Gliese|

* Gliese 257
* Gliese 283
* Gliese 300

Other|

* 171 G. Puppis
* Bran 76
* L 745-46A
* 2MASS 0729−39
* NGC 2423-3
* OH 231.8+4.2
* PSR B0740−28
* PSR B0808−13
* PSR J0737−3039
* PSR J0738−4042
* RX J0812.4−3114
* RX J0822−4300
* SCR J0740−4257
* SWIFT J0732.5−1331
* 4U 0728-25
* WASP-121

* List

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