Table 2
Proposed linear and quadratic trends and cycle periods for the stellar sample.
| Karmn | Name | SpT(a) | No. of spec. | Time baseline (a) | Trend(b) corrcoeff | Parabolic(c) | Cycle auto (a) |  cycle (a) |
Visual inspection(e) | Literature cycle | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| (a) | (a) | ||||||||||
| J09144+526 | HD 79211 | M0.0 | 153 | 2.7 | 0.693 | . | 1.9 | exist (13.2) | nc, pa (Ca+Hα) | ||
| J12123+544S | HD 238090 | M0.0 | 104 | 3.3 | … | 9 | 1.5 | … | nc, pa(*) | ||
| J13450+176 | BD+18 2776 | M0.0 | 29 | 6.0 | −0.653 | . | … | … | (*) | ||
| J14257+236W | BD+24 2733A | M0.0 | 63 | 3.5 | 0.829 | 10 | 1.2 | … | nc, pa(*) | ||
| J02222+478 | BD+47 612 | M0.5 | 55 | 2.0 | … | 9 | … | exist(g) (14.0) | (*) | lin trend Rob13 | |
| J04290+219 | BD+21 652 | M0.5 | 167 | 2.1 | … | 10 | 1.8 | 3.4 (13.9) | nc, pa(*) | ||
| J06105−218 | HD 42581 A | M0.5 | 49 | 3.9 | … | 9 | 2.7 | 14.3(f) (16.2) | cy(*) | 8.4±0.3 SM16 | 8.3 DA19 |
| J12312+086 | BD+09 2636 | M0.5 | 47 | 3.4 | … | 9 | … | … | (*) | ||
| J13299+102 | BD+11 2576 | M0.5 | 354 | 6.1 | … | . | 1.5 | 0.7 (15.7) | nc, pa (Ca) | ||
| J05415+534 | HD 233153 | M1.0 | 95 | 4.1 | 0.705 | . | 1.4 | … | lin(*) +cy(*) | ||
| J16581+257 | BD+25 3173 | M1.0 | 54 | 1.1 | … | 9 | … | … | (*) | ||
| J18051−030 | HD 165222 | M1.0 | 51 | 2.5 | … | 9 | … | 7.6 (12.3) | |||
| J22330+093 | BD+08 4887 | M1.0 | 64 | 5.2 | … | . | 3.1 | … | (*) | ||
| J23245+578 | BD+57 2735 | M1.0 | 61 | 4.6 | −0.740 | . | … | … | (*) | ||
| J02123+035 | BD+02 348 | M1.5 | 65 | 4.3 | … | 9 | … | 15.5(f) (16.0) | (*) | ||
| J03181+382 | HD 275122 | M1.5 | 56 | 4.9 | −0.770 | 10 | … | … | pa(*) | ||
| J05314−036 | HD 36395 | M1.5 | 90 | 2.2 | … | 9 | 1.9 | 11.6(f) (16.3) | nc, pa(*) | 10.8/3.9 SM16 | 3.5 K19 |
| J16254+543 | GJ 625 | M1.5 | 30 | 1.3 | … | 9 | … | … | (*) | 3.3±1.5 SM18 | |
| J22057+656 | G 264-018 A | M1.5 | 90 | 2.6 | … | 10 | … | … | (*) | ||
| J22565+165 | HD 216899 | M1.5 | 548 | 6.1 | … | . | 5.4 | 15.5 (f) (16.2) | 15.5 Per21 | ||
| J11110+304W | HD 97101 B | M2.0 | 51 | 4.1 | … | 9 | … | 10.1 (13.2) | (*) | ||
| J01518+644 | G 244-037 | M2.5 | 21 | 5.2 | 0.705 | . | … | … | (*) | ||
| J19169+051N | V1428 Aql | M2.5 | 125 | 1.7 | … | 10 | … | 12.6 (f) (14.3) | 3.3±0.4 DA19 | 9.3±1.9 SM16 | |
| J16167+672N | EW Dra | M3.0 | 103 | 4.5 | … | 9 | … | … | (*) | ||
| J07274+052 | Luyten's Star | M3.5 | 734 | 6.1 | … | . | 2.8 | 2.8(f) (14.8) | (*) | 6.6±1.3 SM16 | 2.8 Per21 |
| J18346+401 | LP 229-017 | M3.5 | 77 | 4.8 | … | . | 4.0 | … | (*) | ||
Notes. (a)Spectral (sub-)type of M. (b)Pearson's r. (c)Number of flags triggered in the parabolic trend search. (d)Given in parentheses is the observation time baseline for the 
measurements.(e) Abbreviations: nc: no cycle, pa: parabolic trend, lin: linear trend. (*)Conflrmed by visual inspection. (f) Automatic detection of the period based on 
data alone, see Sect. 4.4. (g)Exist: 
data exist, but the criterion of FAP < 0.001 in the GLS is not met.
References. K19: Küker et al. (2019); DA19: Díez Alonso et al. (2019); Per21: Perdelwitz et al. (2021); Rob13: Robertson et al. (2013); SM16: Suárez Mascareño et al. (2016); SM18: Suárez Mascareño et al. (2018).
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